Direct current bus voltage surge suppression method and device

Abstract

The invention discloses a DC bus voltage surge suppression method and device. The method comprises the following steps: monitoring a startup instruction of a photovoltaic system to obtain a first instruction monitoring result; when the first instruction monitoring result shows that the startup instruction is monitored, acquiring historical electrical parameters of the photovoltaic system at the previous moment and current electrical parameters of the photovoltaic system at the current moment, and comparing the historical electrical parameters with the current electrical parameters to obtain an electrical parameter comparison result; when the first instruction monitoring result shows that the starting instruction is not monitored, if a centrifugal machine compressor of the photovoltaic system is started, the starting state of a photovoltaic power generation link of the photovoltaic system is obtained; and determining the operation mode of the photovoltaic direct-drive centrifugal unit in the photovoltaic system according to the electrical parameter comparison result or the starting state. According to the invention, the technical problem of unstable operation of all parts on a common direct current bus such as unit power generation and a compressor under the operation conditions of sudden change of photovoltaic power generation power and unit mode conversion of a photovoltaic centrifugal machine in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and in particular to a method and device for suppressing direct current bus voltage impulses. Background Art

[0002] Photovoltaic centrifuges can cause DC bus voltage adjustment, flicker, drop, and power step mutations under operating conditions such as sudden changes in photovoltaic power generation, unit mode conversion, power grid failure, and project installation and maintenance. In severe cases, the photovoltaic air-conditioning system may collapse and the power grid may be partially paralyzed, affecting unit reliability and user experience.

[0003] The current solution is to determine the relationship between photovoltaic power generation and air conditioning compressor power. When the photovoltaic power generation is less than the power required by the compressor, the compressor frequency is reduced, thereby reducing the difference between photovoltaic power and compressor power consumption and improving system operability. However, the technical solution of not reducing photovoltaic power and reducing compressor power can ensure that photovoltaic power generation is maximized without affecting power generation. At the same time, the reduction of compressor power will sacrifice the user's experience of using air conditioning to a certain extent. To solve this problem, it is necessary to ensure that the photovoltaic power generation is always kept at the maximum and the compressor power is always kept according to the actual air conditioning usage needs. This optimal operation control logic will bring a technical problem. During the change of photovoltaic power and centrifuge power, the supply and demand relationship of the unit's power supply and power consumption is constantly changing. When the photovoltaic power generation power suddenly changes, the photovoltaic air conditioning power supply and power consumption mode fluctuates widely, such as when the unit is turned on and off, the DC bus voltage will be affected by the sudden change of load / power supply power and cause a large increase or drop, causing system operation failure. Especially for photovoltaic direct-drive photovoltaic centrifuge equipment without DC / DC links, the photovoltaic panels, fully controlled rectifier parts, and compressor-side inverter parts are all directly connected to the DC bus of the system. In order to ensure the stable operation of the common DC bus system and avoid compressor jitter, surge or even shutdown problems, the DC bus voltage needs to remain relatively stable and needs to be adjusted as quickly as possible when it changes to restore stability as quickly as possible.

[0004] Figure 1 It is a topological diagram of a photovoltaic centrifuge with a DC / DC link in the prior art, such as Figure 1 As shown, it consists of a photovoltaic panel, a DC / DC converter, a fully controlled rectifier part, an inverter part, and a centrifuge compressor. The DC power generated by the photovoltaic panel is first converted by the DC / DC converter. The voltage on one side of the photovoltaic panel changes with the MPPT optimization, and performs the MPPT optimization function. The DC voltage on the DC bus side remains unchanged, meeting the requirement for stable output power of the inverter part of the centrifuge compressor, that is, the requirement for stable DC voltage. However, this topology has a DC / DC level, which increases the energy loss of 1-2% for the power generated by the photovoltaic panel.

[0005] To address the above-mentioned problems, no effective solution has been proposed yet. Summary of the invention

[0006] The embodiment of the present invention provides a method and device for suppressing DC bus voltage impulse, so as to at least solve the technical problem in the related art that when the photovoltaic power generation of the photovoltaic centrifuge changes suddenly, the unit mode is converted, and other operating conditions are such that the components such as the unit power generation and the compressor on the common DC bus are unstable.

[0007] According to one aspect of an embodiment of the present invention, a method for suppressing DC bus voltage impulse is provided, comprising: monitoring a power-on instruction of a photovoltaic system to obtain a first instruction monitoring result, wherein the power-on instruction is used to instruct an inverter in the photovoltaic system to start; when the first instruction monitoring result indicates that the power-on instruction is detected, obtaining historical electrical parameters of the photovoltaic system at a previous moment and current electrical parameters of the photovoltaic system at a current moment, and comparing the historical electrical parameters with the current electrical parameters to obtain an electrical parameter comparison result; when the first instruction monitoring result indicates that the power-on instruction is not detected, if a centrifuge compressor of the photovoltaic system is started, obtaining the start-up state of a photovoltaic power generation link of the photovoltaic system; and determining the operation mode of a photovoltaic direct-drive centrifugal unit in the photovoltaic system according to the electrical parameter comparison result or the start-up state.

[0008] Optionally, the operating mode of the photovoltaic direct-drive centrifugal unit in the photovoltaic system is determined according to the electrical parameter comparison result, including: when it is determined according to the electrical parameter comparison result that the inverter has a photovoltaic input trend, determining the current state of the compressor in the photovoltaic system; and determining the operating mode of the photovoltaic direct-drive centrifugal unit in the photovoltaic system according to the current state.

[0009] Optionally, the operating mode of the photovoltaic direct-drive centrifugal unit in the photovoltaic system is determined according to the current state, including: when the current state indicates that the compressor is in an operating state, determining that the photovoltaic DC power of the photovoltaic direct-drive centrifugal unit is increased in a predetermined manner, so that the photovoltaic direct-drive centrifugal unit enters a photovoltaic stable start-up mode; when the current state indicates that the compressor is in a non-operating state, determining that the photovoltaic DC power of the photovoltaic direct-drive centrifugal unit enters an engaged state, so that the photovoltaic direct-drive centrifugal unit enters a maximum power generation mode.

[0010] Optionally, if the centrifuge compressor of the photovoltaic system is started, the start state of the photovoltaic power generation link of the photovoltaic system is obtained, including: monitoring the shutdown instruction of the photovoltaic system to obtain a second instruction monitoring result, wherein the shutdown instruction is used to instruct the photovoltaic direct-drive centrifuge unit to shut down; when the second instruction monitoring result indicates that the photovoltaic direct-drive centrifuge unit has received the shutdown instruction, the photovoltaic power generation link is detected to obtain the photovoltaic power generation link detection result; when the second instruction monitoring result indicates that the shutdown instruction has not been received, continue to monitor the shutdown instruction of the photovoltaic system; and determine the start state of the photovoltaic power generation link according to the photovoltaic power generation link detection result.

[0011] Optionally, the operating mode of the photovoltaic direct-drive centrifugal unit in the photovoltaic system is determined according to the on-state, including: when the on-state indicates that the photovoltaic power generation link is turned on, obtaining the current operating frequency of the compressor; comparing the current operating frequency with a preset frequency to obtain a frequency comparison result; and determining the operating mode of the photovoltaic direct-drive centrifugal unit according to the frequency comparison result.

[0012] Optionally, the operating mode of the photovoltaic direct-drive centrifugal unit is determined according to the frequency comparison result, including: when the frequency comparison result indicates that the current operating frequency is less than the preset frequency, determining that the operating mode is a rapid shutdown mode of the photovoltaic direct-drive centrifugal unit; when the frequency comparison result indicates that the current operating frequency is not less than the preset frequency, determining that the operating mode is a steady-state shutdown mode of the photovoltaic direct-drive centrifugal unit.

[0013] Optionally, when the frequency comparison result indicates that the current operating frequency is not less than the preset frequency, the operating mode is determined to be the steady-state shutdown mode of the photovoltaic direct-drive centrifugal unit, including: obtaining the target frequency value of the compressor; reducing the target frequency value to the preset frequency; obtaining the current operating frequency of the compressor again; when the current operating frequency is less than the preset frequency, shutting down the inverter module of the photovoltaic direct-drive centrifugal unit to make the photovoltaic direct-drive centrifugal unit enter the steady-state shutdown mode of the photovoltaic direct-drive centrifugal unit.

[0014] According to another aspect of an embodiment of the present invention, a DC bus voltage impulse suppression device is also provided, including: a monitoring module, used to monitor the power-on instruction of the photovoltaic system to obtain a first instruction monitoring result, wherein the power-on instruction is used to instruct the inverter in the photovoltaic system to start; a first acquisition module, used to obtain the historical electrical parameters of the photovoltaic system at the previous moment and the current electrical parameters of the photovoltaic system at the current moment when the first instruction monitoring result indicates that the power-on instruction is detected, and compare the historical electrical parameters with the current electrical parameters to obtain an electrical parameter comparison result; a second acquisition module, used to obtain the start-up state of the photovoltaic power generation link of the photovoltaic system after the centrifuge compressor of the photovoltaic system is started when the first instruction monitoring result indicates that the power-on instruction is not detected; a determination module, used to determine the operation mode of the photovoltaic direct-drive centrifugal group in the photovoltaic system according to the electrical parameter comparison result or the start-up state.

[0015] Optionally, the determination module includes: a first determination unit, used to determine the current state of the compressor in the photovoltaic system when it is determined that the inverter shows a photovoltaic input trend according to the electrical parameter comparison result; and a second determination unit, used to determine the operating mode of the photovoltaic direct-drive centrifugal unit in the photovoltaic system according to the current state.

[0016] Optionally, the second determination unit includes: a first determination subunit, used to determine that the photovoltaic DC power of the photovoltaic direct-drive centrifugal unit increases in a predetermined manner when the current state indicates that the compressor is in an operating state, so that the photovoltaic direct-drive centrifugal unit enters a photovoltaic stable start-up mode; a second determination subunit, used to determine that the photovoltaic DC power of the photovoltaic direct-drive centrifugal unit enters an engaged state when the current state indicates that the compressor is in a non-operating state, so that the photovoltaic direct-drive centrifugal unit enters a maximum power generation mode.

[0017] Optionally, the second acquisition module includes: a first monitoring unit, used to monitor the shutdown instruction of the photovoltaic system to obtain a second instruction monitoring result, wherein the shutdown instruction is used to instruct the photovoltaic direct-drive centrifugal unit to shut down; a detection unit, used to detect the photovoltaic power generation link when the second instruction monitoring result indicates that the photovoltaic direct-drive centrifugal unit has received the shutdown instruction, and obtain the photovoltaic power generation link detection result; a second monitoring unit, used to continue to monitor the shutdown instruction of the photovoltaic system when the second instruction monitoring result indicates that the shutdown instruction has not been received; a third determination unit, used to determine the open state of the photovoltaic power generation link according to the photovoltaic power generation link detection result.

[0018] Optionally, the determination module includes: an acquisition unit, used to acquire the current operating frequency of the compressor when the on state indicates that the photovoltaic power generation link is turned on; a comparison unit, used to compare the current operating frequency with a preset frequency to obtain a frequency comparison result; and a fourth determination unit, used to determine the operating mode of the photovoltaic direct-drive centrifugal unit according to the frequency comparison result.

[0019] Optionally, the fourth determination unit includes: a third determination subunit, used to determine that the operating mode is a rapid shutdown mode of the photovoltaic direct-drive centrifugal unit when the frequency comparison result indicates that the current operating frequency is less than the preset frequency; and a fourth determination subunit, used to determine that the operating mode is a steady-state shutdown mode of the photovoltaic direct-drive centrifugal unit when the frequency comparison result indicates that the current operating frequency is not less than the preset frequency.

[0020] Optionally, the fourth determination subunit includes: a first acquisition subunit, used to acquire the target frequency value of the compressor; a reduction subunit, used to reduce the target frequency value to the preset frequency; a second acquisition subunit, used to obtain the current operating frequency of the compressor again; and a shutdown subunit, used to shut down the inverter module of the photovoltaic direct-drive centrifugal unit when the current operating frequency is less than the preset frequency, so that the photovoltaic direct-drive centrifugal unit enters the steady-state shutdown mode of the photovoltaic direct-drive centrifugal unit.

[0021] According to another aspect of an embodiment of the present invention, there is further provided a photovoltaic direct-drive centrifuge, wherein the photovoltaic direct-drive centrifuge uses any one of the above-mentioned methods for suppressing DC bus voltage impulses.

[0022] According to another aspect of an embodiment of the present invention, a computer-readable storage medium is further provided, wherein the computer-readable storage medium includes a stored program, wherein the program executes any one of the above-mentioned methods for suppressing DC bus voltage impulses.

[0023] According to another aspect of an embodiment of the present invention, a processor is further provided, and the processor is used to run a program, wherein the program executes any one of the above-mentioned methods for suppressing DC bus voltage impulses when running.

[0024] According to another aspect of an embodiment of the present invention, a computer program product is provided, comprising computer instructions, wherein when the computer instructions are executed by a processor, any one of the above-mentioned methods for suppressing DC bus voltage impulse is executed.

[0025] In an embodiment of the present invention, a power-on instruction of a photovoltaic system is monitored to obtain a first instruction monitoring result, wherein the power-on instruction is used to instruct an inverter in the photovoltaic system to start; when the first instruction monitoring result indicates that a power-on instruction is detected, the historical electrical parameters of the photovoltaic system at the previous moment and the current electrical parameters of the photovoltaic system at the current moment are obtained, and the historical electrical parameters are compared with the current electrical parameters to obtain an electrical parameter comparison result; when the first instruction monitoring result indicates that no power-on instruction is detected, if the centrifuge compressor of the photovoltaic system is started, the start-up state of the photovoltaic power generation link of the photovoltaic system is obtained; and the operation mode of the photovoltaic direct-drive centrifugal unit in the photovoltaic system is determined according to the electrical parameter comparison result or the start-up state. The technical solution provided by the present invention achieves the purpose of monitoring the startup and shutdown instructions of the photovoltaic system, comparing and analyzing the historical and current electrical parameters of the photovoltaic system, determining the operating mode of the photovoltaic direct-drive centrifugal unit, and stably controlling the DC bus voltage, thereby achieving the technical effect of simultaneously meeting the maximum power generation of photovoltaic power generation and the on-demand operation of the centrifuge compressor without derating, improving the stability and reliability of the photovoltaic centrifuge, and further solving the technical problem in the related technology that the components on the common DC bus such as the unit power generation, the compressor, etc. are unstable when the photovoltaic power generation of the photovoltaic centrifuge changes suddenly, the unit mode is converted, and so on. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0027] Figure 1 It is a topological diagram of a photovoltaic centrifuge with a DC / DC link in the prior art;

[0028] Figure 2 It is a hardware structure block diagram of a mobile terminal of a DC bus voltage impulse suppression method according to an embodiment of the present invention;

[0029] Figure 3 is a flow chart of a method for suppressing DC bus voltage impulse according to an embodiment of the present invention;

[0030] Figure 4 is a flow chart of a method for suppressing DC bus voltage impulse for a photovoltaic centrifuge according to an embodiment of the present invention;

[0031] Figure 5 is a topological diagram of a photovoltaic direct-drive centrifuge according to an embodiment of the present invention;

[0032] Figure 6 is a schematic diagram of a DC bus voltage impulse suppression device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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 should fall within the scope of protection of the present invention.

[0034] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0035] As introduced in the background technology, in the related art, the mobile robot cannot delete the information of the moving object, and a detour occurs when the car drives to this position again, which easily leads to the defect of excessively long driving path planning and driving time, resulting in increased time and energy costs. In the embodiments of the present invention, a control method and device for a mobile robot, a mobile robot, a computer-readable storage medium, and a processor are provided.

[0036] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0037] The method embodiments provided in the embodiments of the present invention can be executed in a mobile terminal, a computer terminal or a similar computing device. Taking running on a mobile terminal as an example, Figure 2 1 is a hardware structure block diagram of a mobile terminal of a DC bus voltage impulse suppression method according to an embodiment of the present invention. Figure 2 As shown, the mobile terminal may include one or more ( Figure 2 Only one is shown in the figure) a processor 202 (the processor 202 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA) and a memory 204 for storing data, wherein the mobile terminal may also include a transmission device 206 and an input / output device 208 for communication functions. It can be understood by those skilled in the art that Figure 2The structure shown is only for illustration and does not limit the structure of the mobile terminal. Figure 2 More or fewer components as shown, or with Figure 2 Different configurations shown.

[0038] The memory 204 can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to the DC bus voltage impulse suppression method in the embodiment of the present invention. The processor 202 executes various functional applications and data processing by running the computer program stored in the memory 204, that is, the above method is implemented. The memory 204 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely arranged relative to the processor 202, and these remote memories can be connected to the mobile terminal via a network. Examples of the above network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof. The transmission device 206 is used to receive or send data via a network. The specific example of the above network may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 206 includes a network adapter (Network Interface Controller, referred to as NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 206 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0039] According to an embodiment of the present invention, a method embodiment of a DC bus voltage surge suppression method is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0040] Figure 3 is a flow chart of a method for suppressing DC bus voltage impulse according to an embodiment of the present invention. Figure 3 As shown, the method comprises the following steps:

[0041] Step S302 , monitoring a power-on instruction of the photovoltaic system to obtain a first instruction monitoring result, wherein the power-on instruction is used to instruct a converter in the photovoltaic system to start.

[0042] In this embodiment, the power-on instruction (i.e., the first instruction) of the photovoltaic system is monitored, and the power-on instruction of the user can be monitored in time to ensure that the inverter can respond and start quickly, thereby improving the response speed of the system. It can be checked whether there are any faults or abnormal conditions, and its startup process can be managed more intelligently and efficiently to ensure stable and reliable operation of the system.

[0043] Figure 4 is a flow chart of a method for suppressing DC bus voltage impulse for a photovoltaic centrifuge according to an embodiment of the present invention. Figure 4 As shown, first determine whether the photovoltaic inverter has been issued a start-up instruction, and when the start-up instruction is detected, instruct the inverter to start.

[0044] Step S304, when the first instruction monitoring result indicates that a power-on instruction is detected, the historical electrical parameters of the photovoltaic system at the last moment and the current electrical parameters of the photovoltaic system at the current moment are obtained, and the historical electrical parameters are compared with the current electrical parameters to obtain an electrical parameter comparison result.

[0045] Optionally, the electrical parameters may include but are not limited to: open circuit voltage, short circuit current, maximum power point voltage, fill factor, etc.

[0046] In this embodiment, by monitoring the power-on instruction, it can be ensured that the photovoltaic system responds immediately when receiving the start-up signal. By analyzing the comparison results of historical electrical parameters and current electrical parameters, voltage shocks can be discovered in time to avoid adverse effects on the system, thereby taking corresponding suppression measures to protect the safe operation of the photovoltaic system.

[0047] like Figure 4 As shown, if it is detected that a power-on command is issued at this time, the system allows the photovoltaic power to be put into use, and compares the DC voltage and current change trends with the previous moment.

[0048] Step S306, when the first instruction monitoring result indicates that no power-on instruction is detected, if the centrifuge compressor of the photovoltaic system is started, the start state of the photovoltaic power generation link of the photovoltaic system is obtained.

[0049] In this embodiment, the start-up status of the photovoltaic power generation link in the photovoltaic system can be monitored. By monitoring the start-up status of the centrifuge compressor, it can be determined whether the photovoltaic system is operating normally, so that timely measures can be taken to suppress the impact of the DC bus voltage, thereby protecting the photovoltaic system from excessive voltage impacts, extending the service life of the system, and also improving the stability and safety of the system.

[0050] Figure 5 is a topological diagram of a photovoltaic direct-drive centrifuge according to an embodiment of the present invention, such as Figure 5As shown, it consists of a photovoltaic panel, a fully controlled rectifier part, an inverter part, and a centrifuge compressor. The DC power generated by the photovoltaic panel directly enters the inverter part to supply the centrifuge compressor without being converted by a DC / DC converter, or directly enters the fully controlled rectifier part to be converted into AC power to be used for power generation in the three-phase grid. Figure 1 It can reduce the energy loss of the first-stage DC / DC conversion link by 1-2%.

[0051] Step S308, determining the operation mode of the photovoltaic direct-drive centrifugal unit in the photovoltaic system according to the electrical parameter comparison result or the start-up state.

[0052] In this embodiment, the specific operation mode of the direct-drive centrifugal unit is determined by monitoring the electrical parameters or switch status in the photovoltaic system, and the operation mode of the direct-drive centrifugal unit can be adjusted in real time to reduce the impact of the DC bus voltage and protect the stable operation of the photovoltaic system.

[0053] like Figure 4 As shown, there are 4 modes to switch to for different source-load impacts, including: PV power stable start-up mode, PV maximum power generation mode, unit fast shutdown mode and unit stable shutdown mode.

[0054] As can be seen from the above, in an embodiment of the present invention, the power-on instruction of the photovoltaic system is monitored to obtain a first instruction monitoring result, wherein the power-on instruction is used to instruct the inverter in the photovoltaic system to start; when the first instruction monitoring result indicates that the power-on instruction is detected, the historical electrical parameters of the photovoltaic system at the previous moment and the current electrical parameters of the photovoltaic system at the current moment are obtained, and the historical electrical parameters are compared with the current electrical parameters to obtain an electrical parameter comparison result; when the first instruction monitoring result indicates that the power-on instruction is not detected, if the centrifuge compressor of the photovoltaic system is started, the start-up state of the photovoltaic power generation link of the photovoltaic system is obtained; the operation mode of the photovoltaic direct-drive centrifugal unit in the photovoltaic system is determined according to the electrical parameter comparison result or the start-up state, thereby achieving the purpose of monitoring the power-on instruction and the shutdown instruction of the photovoltaic system, and comparing and analyzing the historical and current electrical parameters of the photovoltaic system, determining the operation mode of the photovoltaic direct-drive centrifugal unit, and stabilizing the control of the DC bus voltage, thereby achieving the technical effect of simultaneously meeting the maximum power generation of photovoltaic power generation and the on-demand non-derating operation of the centrifuge compressor, and improving the stability and reliability of the photovoltaic centrifuge.

[0055] The technical solution provided by the embodiment of the present invention solves the technical problem in the related art that when the photovoltaic centrifuge photovoltaic power generation power suddenly changes, the unit mode is converted, and other operating conditions are such that the components such as the unit power generation and the compressor on the common DC bus are unstable.

[0056] According to the above embodiment of the present invention, the operation mode of the photovoltaic direct-drive centrifugal unit in the photovoltaic system is determined according to the electrical parameter comparison result, including: when it is determined according to the electrical parameter comparison result that the inverter has a photovoltaic input trend, determining the current state of the compressor in the photovoltaic system; determining the operation mode of the photovoltaic direct-drive centrifugal unit in the photovoltaic system according to the current state.

[0057] In this embodiment, by comparing electrical parameters to determine whether the inverter has a photovoltaic input trend, detecting whether the current compressor is running, and thus determining the current state of the compressor in the photovoltaic system, the operating mode of the photovoltaic direct-drive centrifugal unit in the photovoltaic system is determined based on the current state, which helps to ensure the stable operation of the photovoltaic system.

[0058] In the above embodiment of the present invention, the operating mode of the photovoltaic direct-drive centrifugal unit in the photovoltaic system is determined according to the current state, including: when the current state indicates that the compressor is in an operating state, determining that the photovoltaic DC power of the photovoltaic direct-drive centrifugal unit is increased in a predetermined manner so that the photovoltaic direct-drive centrifugal unit enters a photovoltaic stable start-up mode; when the current state indicates that the compressor is in a non-operating state, determining that the photovoltaic DC power of the photovoltaic direct-drive centrifugal unit enters an input state so that the photovoltaic direct-drive centrifugal unit enters a maximum power generation mode.

[0059] In this embodiment, the photovoltaic DC power of the photovoltaic direct-drive centrifugal unit can be controlled. By adjusting the photovoltaic DC power of the photovoltaic direct-drive centrifugal unit according to the operating status of the compressor, the power generation mode of the photovoltaic direct-drive centrifugal unit can be effectively controlled, thereby achieving the suppression of DC bus voltage shock. When the compressor is in operation, the photovoltaic DC power of the photovoltaic direct-drive centrifugal unit is increased to make it enter a stable start-up mode, thereby reducing the impact of voltage shock. When the compressor is not in operation, the maximum power generation mode is entered to maximize power generation, thereby maintaining the stability of the DC bus voltage.

[0060] like Figure 4 As shown, if the compressor is in operation at this time, the PV DC power is added to the ramp function for gradual increase control, and the ramp function is added to the allowable value of the PV DC power for slow increase control to reduce the instantaneous power impact of the system. At this time, the system is in the PV stable start-up mode. If the compressor is not running at this time, the PV DC power is directly put into operation. At this time, the system is in the PV maximum power generation mode, which can maximize the use of photovoltaic resources.

[0061] It should be noted that the ramp function parameters added above are related to the system photovoltaic capacity, hardware capacitor configuration, DC bus voltage control algorithm and control parameters. According to the empirical values ​​tested, for large-scale photovoltaic centrifuge equipment of 500kW and above, the photovoltaic power generation start-up speed is generally controlled to rise from 0% to 100% in about 1S. The ramp function parameters are configured according to this rise time. At this time, the system can ensure that the maximum power generation is achieved at the fastest speed while ensuring low fluctuations in the DC bus voltage. At this time, the system is in photovoltaic stable start-up mode.

[0062] According to the above embodiment of the present invention, after the centrifuge compressor of the photovoltaic system is started, the start state of the photovoltaic power generation link of the photovoltaic system is obtained, including: monitoring the shutdown instruction of the photovoltaic system to obtain a second instruction monitoring result, wherein the shutdown instruction is used to instruct the photovoltaic direct-drive centrifugal unit to shut down; when the second instruction monitoring result indicates that the photovoltaic direct-drive centrifugal unit has received the shutdown instruction, the photovoltaic power generation link is detected to obtain the photovoltaic power generation link detection result; when the second instruction monitoring result indicates that the shutdown instruction has not been received, the shutdown instruction of the photovoltaic system continues to be monitored; and the start state of the photovoltaic power generation link is determined according to the photovoltaic power generation link detection result.

[0063] In this embodiment, the shutdown instruction of the photovoltaic system (i.e., the second instruction) can be monitored to ensure that the photovoltaic direct-drive centrifugal unit can be properly shut down when receiving the shutdown instruction. At the same time, by detecting the state of the photovoltaic power generation link, the opening state of the photovoltaic power generation link can be determined, thereby effectively controlling the impact of the DC bus voltage and protecting the normal operation of the photovoltaic system.

[0064] like Figure 4 As shown, after the centrifuge compressor is started, the unit is continuously checked to see if a centrifuge compressor shutdown command has been issued. If the unit receives a shutdown command, it first checks to see if the photovoltaic power generation link of the system is turned on. If the photovoltaic power generation is not turned on, the inverter module is immediately turned off and the compressor is shut down. At this time, the system is in a fast shutdown mode.

[0065] According to the above embodiment of the present invention, the operating mode of the photovoltaic direct-drive centrifugal unit in the photovoltaic system is determined according to the start-up state, including: when the start-up state indicates that the photovoltaic power generation link is turned on, obtaining the current operating frequency of the compressor; comparing the current operating frequency with the preset frequency to obtain a frequency comparison result; and determining the operating mode of the photovoltaic direct-drive centrifugal unit according to the frequency comparison result.

[0066] In this embodiment, the operating mode of the photovoltaic direct-drive centrifugal unit can be controlled. If the photovoltaic power generation link of the system is turned on, the current operating frequency of the compressor is detected, and the operating mode of the photovoltaic direct-drive centrifugal unit is determined by comparing the current operating frequency of the compressor with the preset frequency.

[0067] In the above embodiment of the present invention, the operating mode of the photovoltaic direct-drive centrifugal unit is determined according to the frequency comparison result, including: when the frequency comparison result indicates that the current operating frequency is less than the preset frequency, the operating mode is determined to be the rapid shutdown mode of the photovoltaic direct-drive centrifugal unit; when the frequency comparison result indicates that the current operating frequency is not less than the preset frequency, the operating mode is determined to be the steady-state shutdown mode of the photovoltaic direct-drive centrifugal unit.

[0068] In this embodiment, the shutdown mode of the photovoltaic direct-drive centrifugal unit can be determined based on the comparison result between the current operating frequency and the preset frequency, and it is determined whether the current operating frequency of the compressor is less than or equal to the preset value (i.e., the preset frequency). If the frequency requirement is met, a rapid shutdown operation is performed. When the current operating frequency is less than the preset frequency, the rapid shutdown mode is adopted to shut down the unit as soon as possible to avoid excessive DC bus voltage shock. When the current operating frequency is not less than the preset frequency, the steady-state shutdown mode is adopted to shut down the unit in an orderly manner to steadily reduce the DC bus voltage, thereby effectively suppressing the DC bus voltage shock.

[0069] In the above embodiment of the present invention, when the frequency comparison result indicates that the current operating frequency is not less than the preset frequency, the operating mode is determined to be the steady-state shutdown mode of the photovoltaic direct-drive centrifugal unit, including: obtaining the target frequency value of the compressor; lowering the target frequency value to the preset frequency; obtaining the current operating frequency of the compressor again; when the current operating frequency is less than the preset frequency, turning off the inverter module of the photovoltaic direct-drive centrifugal unit to make the photovoltaic direct-drive centrifugal unit enter the steady-state shutdown mode of the photovoltaic direct-drive centrifugal unit.

[0070] In this embodiment, the operating state of the photovoltaic direct-drive centrifugal unit is controlled by adjusting the operating frequency of the compressor to avoid the impact of the DC bus voltage. When the current operating frequency of the compressor is lower than the preset frequency, the inverter module of the photovoltaic direct-drive centrifugal unit is turned off to enter a steady-state shutdown mode to reduce the impact on the DC bus voltage.

[0071] Specifically, if the current operating frequency of the system compressor is greater than the preset value, the compressor target frequency value is reduced to the preset value, and the inverter module is turned off after detecting that the compressor operating frequency is less than or equal to the preset value. At this time, the system is in stable shutdown mode.

[0072] It should be noted that the above preset value A is related to the compressor capacity, hardware capacitor configuration, DC bus voltage control algorithm and control parameters, and is generally between 1 / 3 and 1 / 2 of the rated frequency of the compressor. The highest allowable shutdown preset value A1 can be found based on tests under the premise of low DC bus voltage fluctuation, so that the system can respond to the shutdown command as quickly as possible under the premise of low DC bus voltage fluctuation.

[0073] The technical solution provided by the above-mentioned embodiment of the present invention solves the following problems: 1) Solving the problem of large bus voltage fluctuation and slow recovery under the operating conditions such as sudden change of photovoltaic power generation and unit mode conversion of photovoltaic centrifuge; 2) Solving the problem of unstable operation of various components on the common DC bus such as unit power generation and compressor under the operating conditions such as sudden change of photovoltaic power generation and unit mode conversion of photovoltaic centrifuge; 3) Solving the problem that the conventional solution cannot simultaneously meet the maximum power generation of photovoltaic power generation and the operation of centrifuge compressor without de-rating on demand. At the same time, it has the following beneficial effects: it can achieve the effect of simultaneously meeting the maximum power generation of photovoltaic power generation and the operation of centrifuge compressor without de-rating on demand, and solve the problem of large bus voltage fluctuation and slow recovery under the operating conditions such as sudden change of photovoltaic power generation and unit mode conversion of photovoltaic centrifuge and the problem of unstable operation of various components on the common DC bus such as unit power generation and compressor.

[0074] That is, the technical solution provided by the embodiment of the present invention comprehensively considers various factors and can stably control the stable startup of photovoltaic power generation without adding a DC / DC link topology structure, and can meet the centrifuge compressor's requirements for high stability of the DC bus voltage, thereby achieving the effect of simultaneously satisfying the stable startup of photovoltaic power generation and the stable operation of the centrifuge compressor.

[0075] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described order of actions, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0076] Through the description of the above implementation methods, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods of each embodiment of the present application.

[0077] According to an embodiment of the present invention, a DC bus voltage impulse suppression device for implementing the DC bus voltage impulse suppression method is also provided. Figure 6 is a schematic diagram of a DC bus voltage impulse suppression device according to an embodiment of the present invention. Figure 6As shown, the device includes: a monitoring module 601, a first acquisition module 603, a second acquisition module 605 and a determination module 607. The DC bus voltage impulse suppression device is described below.

[0078] The monitoring module 601 is used to monitor the power-on instruction of the photovoltaic system to obtain a first instruction monitoring result, wherein the power-on instruction is used to instruct the inverter in the photovoltaic system to start.

[0079] The first acquisition module 603 is used to obtain the historical electrical parameters of the photovoltaic system at the previous moment and the current electrical parameters of the photovoltaic system at the current moment when the first instruction monitoring result indicates that the power-on instruction is detected, and compare the historical electrical parameters with the current electrical parameters to obtain the electrical parameter comparison result.

[0080] The second acquisition module 605 is used to acquire the start-up state of the photovoltaic power generation link of the photovoltaic system after the centrifuge compressor of the photovoltaic system is started when the first instruction monitoring result indicates that no start-up instruction is detected.

[0081] The determination module 607 is used to determine the operation mode of the photovoltaic direct-drive centrifugal unit in the photovoltaic system according to the electrical parameter comparison result or the start-up state.

[0082] It should be noted here that the above-mentioned monitoring module 601, the first acquisition module 603, the second acquisition module 605 and the determination module 607 correspond to steps S302 to S308 in the above-mentioned embodiments, and the four modules are the same as the instances and application scenarios implemented by the corresponding steps, but are not limited to the contents disclosed in the above-mentioned embodiments.

[0083] As can be seen from the above, in the scheme recorded in the above embodiment of the present invention, first, the monitoring module can be used to monitor the power-on instruction of the photovoltaic system to obtain the first instruction monitoring result, wherein the power-on instruction is used to instruct the inverter in the photovoltaic system to start; then, the first acquisition module can be used to obtain the historical electrical parameters of the photovoltaic system at the previous moment and the current electrical parameters of the photovoltaic system at the current moment when the first instruction monitoring result indicates that the power-on instruction is detected, and the historical electrical parameters are compared with the current electrical parameters to obtain the electrical parameter comparison result; secondly, the second acquisition module can be used to obtain the start-up state of the photovoltaic power generation link of the photovoltaic system after the centrifuge compressor of the photovoltaic system is started when the first instruction monitoring result indicates that the power-on instruction is not detected; finally, the determination module can be used to determine the operation mode of the photovoltaic direct-drive centrifugal unit in the photovoltaic system according to the electrical parameter comparison result or the start-up state, thereby achieving the purpose of monitoring the power-on instruction and the shutdown instruction of the photovoltaic system, and comparing and analyzing the historical and current electrical parameters of the photovoltaic system, determining the operation mode of the photovoltaic direct-drive centrifugal unit, and stabilizing the control of the DC bus voltage, thereby achieving the technical effect of simultaneously meeting the maximum power generation of photovoltaic power generation and the on-demand operation of the centrifuge compressor without derating, and improving the stability and reliability of the photovoltaic centrifuge.

[0084] The technical solution provided by the embodiment of the present invention solves the technical problem in the related art that when the photovoltaic centrifuge photovoltaic power generation power suddenly changes, the unit mode is converted, and other operating conditions are such that the components such as the unit power generation and the compressor on the common DC bus are unstable.

[0085] In an optional embodiment, the determination module includes: a first determination unit, used to determine the current state of the compressor in the photovoltaic system when it is determined that the inverter has a photovoltaic input trend according to the electrical parameter comparison result; a second determination unit, used to determine the operating mode of the photovoltaic direct-drive centrifugal unit in the photovoltaic system according to the current state.

[0086] In an optional embodiment, the second determination unit includes: a first determination subunit, used to determine that the photovoltaic DC power of the photovoltaic direct-drive centrifugal unit increases in a predetermined manner when the current state indicates that the compressor is in an operating state, so that the photovoltaic direct-drive centrifugal unit enters a photovoltaic stable start-up mode; a second determination subunit, used to determine that the photovoltaic DC power of the photovoltaic direct-drive centrifugal unit enters an engaged state when the current state indicates that the compressor is in a non-operating state, so that the photovoltaic direct-drive centrifugal unit enters a maximum power generation mode.

[0087] In an optional embodiment, the second acquisition module includes: a first monitoring unit, used to monitor the shutdown instruction of the photovoltaic system to obtain a second instruction monitoring result, wherein the shutdown instruction is used to instruct the photovoltaic direct-drive centrifugal unit to shut down; a detection unit, used to detect the photovoltaic power generation link when the second instruction monitoring result indicates that the photovoltaic direct-drive centrifugal unit has received the shutdown instruction, and obtain the photovoltaic power generation link detection result; the second monitoring unit, used to continue to monitor the shutdown instruction of the photovoltaic system when the second instruction monitoring result indicates that the shutdown instruction has not been received; a third determination unit, used to determine the opening state of the photovoltaic power generation link according to the photovoltaic power generation link detection result.

[0088] In an optional embodiment, the determination module includes: an acquisition unit, which is used to obtain the current operating frequency of the compressor when the on state indicates that the photovoltaic power generation link is turned on; a comparison unit, which is used to compare the current operating frequency with the preset frequency to obtain a frequency comparison result; and a fourth determination unit, which is used to determine the operating mode of the photovoltaic direct-drive centrifugal unit according to the frequency comparison result.

[0089] In an optional embodiment, the fourth determination unit includes: a third determination subunit, used to determine that the operating mode is a rapid shutdown mode of the photovoltaic direct-drive centrifugal unit when the frequency comparison result indicates that the current operating frequency is less than the preset frequency; a fourth determination subunit, used to determine that the operating mode is a steady-state shutdown mode of the photovoltaic direct-drive centrifugal unit when the frequency comparison result indicates that the current operating frequency is not less than the preset frequency.

[0090] In an optional embodiment, the fourth determination subunit includes: a first acquisition subunit, used to obtain the target frequency value of the compressor; a reduction subunit, used to reduce the target frequency value to a preset frequency; a second acquisition subunit, used to obtain the current operating frequency of the compressor again; and a shutdown subunit, used to shut down the inverter module of the photovoltaic direct-drive centrifugal unit when the current operating frequency is less than the preset frequency, so that the photovoltaic direct-drive centrifugal unit enters a steady-state shutdown mode of the photovoltaic direct-drive centrifugal unit.

[0091] According to another aspect of an embodiment of the present invention, a photovoltaic direct-drive centrifuge is provided. The photovoltaic direct-drive centrifuge uses any of the above-mentioned methods for suppressing DC bus voltage impacts.

[0092] According to another aspect of an embodiment of the present invention, a processor is further provided, and the processor is used to run a program, wherein when the program is run, any one of the above-mentioned methods for suppressing direct current bus voltage impulses is executed.

[0093] According to another aspect of an embodiment of the present invention, a computer program product is provided, including computer instructions, and when the computer instructions are executed by a processor, any one of the above-mentioned methods for suppressing DC bus voltage impulse is executed.

[0094] According to another aspect of an embodiment of the present invention, a computer-readable storage medium is further provided, the computer-readable storage medium comprising a stored program, wherein the program executes any one of the above-mentioned methods for suppressing DC bus voltage impulses.

[0095] Optionally, in this embodiment, the computer-readable storage medium may be located in any one of the computer terminals in a computer terminal group in a computer network, or in any one of the communication devices in a communication device group.

[0096] Optionally, in this embodiment, the computer-readable storage medium is configured to store program codes for executing the following steps: monitoring the power-on instruction of the photovoltaic system to obtain a first instruction monitoring result, wherein the power-on instruction is used to instruct the inverter in the photovoltaic system to start; when the first instruction monitoring result indicates that the power-on instruction is detected, obtaining the historical electrical parameters of the photovoltaic system at the previous moment and the current electrical parameters of the photovoltaic system at the current moment, and comparing the historical electrical parameters with the current electrical parameters to obtain an electrical parameter comparison result; when the first instruction monitoring result indicates that the power-on instruction is not detected, if the centrifuge compressor of the photovoltaic system is started, obtaining the start-up state of the photovoltaic power generation link of the photovoltaic system; and determining the operation mode of the photovoltaic direct-drive centrifugal unit in the photovoltaic system according to the electrical parameter comparison result or the start-up state.

[0097] Optionally, in this embodiment, the computer-readable storage medium is configured to store program codes for executing the following steps: when it is determined that the inverter has a photovoltaic input trend based on the electrical parameter comparison result, determining the current state of the compressor in the photovoltaic system; and determining the operating mode of the photovoltaic direct-drive centrifugal unit in the photovoltaic system based on the current state.

[0098] Optionally, in this embodiment, the computer-readable storage medium is configured to store program codes for executing the following steps: when the current state indicates that the compressor is in an operating state, determining that the photovoltaic DC power of the photovoltaic direct-drive centrifugal unit is increased in a predetermined manner so that the photovoltaic direct-drive centrifugal unit enters a photovoltaic stable start-up mode; when the current state indicates that the compressor is in a non-operating state, determining that the photovoltaic DC power of the photovoltaic direct-drive centrifugal unit enters an engaged state so that the photovoltaic direct-drive centrifugal unit enters a maximum power generation mode.

[0099] Optionally, in this embodiment, the computer-readable storage medium is configured to store program codes for executing the following steps: monitoring the shutdown instruction of the photovoltaic system to obtain a second instruction monitoring result, wherein the shutdown instruction is used to instruct the photovoltaic direct-drive centrifugal unit to shut down; when the second instruction monitoring result indicates that the photovoltaic direct-drive centrifugal unit has received the shutdown instruction, detecting the photovoltaic power generation link to obtain the photovoltaic power generation link detection result; when the second instruction monitoring result indicates that the shutdown instruction has not been received, continuing to monitor the shutdown instruction of the photovoltaic system; and determining the opening state of the photovoltaic power generation link according to the photovoltaic power generation link detection result.

[0100] Optionally, in this embodiment, the computer-readable storage medium is configured to store program codes for executing the following steps: when the on state indicates that the photovoltaic power generation link is turned on, obtaining the current operating frequency of the compressor; comparing the current operating frequency with the preset frequency to obtain a frequency comparison result; and determining the operating mode of the photovoltaic direct-drive centrifugal unit according to the frequency comparison result.

[0101] Optionally, in this embodiment, the computer-readable storage medium is configured to store program codes for executing the following steps: when the frequency comparison result indicates that the current operating frequency is less than the preset frequency, determining that the operating mode is a rapid shutdown mode of the photovoltaic direct-drive centrifugal unit; when the frequency comparison result indicates that the current operating frequency is not less than the preset frequency, determining that the operating mode is a steady-state shutdown mode of the photovoltaic direct-drive centrifugal unit.

[0102] Optionally, in this embodiment, the computer-readable storage medium is configured to store program codes for executing the following steps: obtaining a target frequency value of the compressor; lowering the target frequency value to a preset frequency; obtaining the current operating frequency of the compressor again; and when the current operating frequency is less than the preset frequency, shutting down the inverter module of the photovoltaic direct-drive centrifugal unit to allow the photovoltaic direct-drive centrifugal unit to enter a steady-state shutdown mode of the photovoltaic direct-drive centrifugal unit.

[0103] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0104] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0105] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0106] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0107] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0108] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0109] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for suppressing DC bus voltage impulse, characterized in that: Applied to a photovoltaic system, the photovoltaic system includes a photovoltaic direct-drive centrifuge, including: Monitoring a power-on instruction of the photovoltaic system to obtain a first instruction monitoring result, wherein the power-on instruction is used to instruct a converter in the photovoltaic system to start; When the first instruction monitoring result indicates that the power-on instruction is detected, obtaining the historical electrical parameters of the photovoltaic system at the last moment and the current electrical parameters of the photovoltaic system at the current moment, and comparing the historical electrical parameters with the current electrical parameters to obtain an electrical parameter comparison result; When the first instruction monitoring result indicates that the startup instruction is not detected, if the centrifuge compressor of the photovoltaic system is started, the startup state of the photovoltaic power generation link of the photovoltaic system is obtained; The operation mode of the photovoltaic direct-drive centrifugal unit in the photovoltaic system is determined according to the electrical parameter comparison result or the start-up state.

2. The DC bus voltage impulse suppression method according to claim 1, characterized in that: Determining the operation mode of the photovoltaic direct-drive centrifugal unit in the photovoltaic system according to the electrical parameter comparison result includes: When it is determined according to the electrical parameter comparison result that the converter has a photovoltaic input trend, determining a current state of a compressor in the photovoltaic system; An operating mode of the photovoltaic direct-drive centrifugal unit in the photovoltaic system is determined according to the current state.

3. The DC bus voltage impulse suppression method according to claim 2, characterized in that: Determining the operation mode of the photovoltaic direct-drive centrifugal unit in the photovoltaic system according to the current state includes: When the current state indicates that the compressor is in operation, determining that the photovoltaic DC power of the photovoltaic direct-drive centrifugal unit is increased in a predetermined manner so that the photovoltaic direct-drive centrifugal unit enters a photovoltaic stable start-up mode; When the current state indicates that the compressor is in a non-operating state, it is determined that the photovoltaic direct current power of the photovoltaic direct-driven centrifugal unit enters an engaged state, so that the photovoltaic direct-driven centrifugal unit enters a maximum power generation mode.

4. The DC bus voltage impulse suppression method according to claim 1, characterized in that: If the centrifuge compressor of the photovoltaic system is started, obtaining the start-up state of the photovoltaic power generation link of the photovoltaic system includes: The shutdown command of the photovoltaic system is monitored to obtain a second command monitoring result, wherein the shutdown command is used to instruct the photovoltaic direct-drive centrifugal unit to shut down; When the second instruction monitoring result indicates that the photovoltaic direct-drive centrifugal unit has received the shutdown instruction, the photovoltaic power generation link is detected to obtain a photovoltaic power generation link detection result; When the second instruction monitoring result indicates that the shutdown instruction has not been received, continue to monitor the shutdown instruction of the photovoltaic system; The on state of the photovoltaic power generation link is determined according to the detection result of the photovoltaic power generation link.

5. The DC bus voltage impulse suppression method according to claim 1, characterized in that: Determining the operation mode of the photovoltaic direct-drive centrifugal unit in the photovoltaic system according to the start-up state includes: When the on state indicates that the photovoltaic power generation link is on, obtaining the current operating frequency of the compressor; Compare the current operating frequency with the preset frequency to obtain a frequency comparison result; The operation mode of the photovoltaic direct-drive centrifugal unit is determined according to the frequency comparison result.

6. The DC bus voltage impulse suppression method according to claim 5, characterized in that: Determining the operation mode of the photovoltaic direct-drive centrifugal unit according to the frequency comparison result includes: When the frequency comparison result indicates that the current operating frequency is less than the preset frequency, determining that the operating mode is a photovoltaic direct-drive centrifugal unit rapid shutdown mode; When the frequency comparison result indicates that the current operating frequency is not less than the preset frequency, it is determined that the operating mode is a steady-state shutdown mode of the photovoltaic direct-drive centrifugal unit.

7. The DC bus voltage impulse suppression method according to claim 6, characterized in that: When the frequency comparison result indicates that the current operating frequency is not less than the preset frequency, determining that the operating mode is a steady-state shutdown mode of the photovoltaic direct-drive centrifugal unit includes: Acquiring a target frequency value of the compressor; Lowering the target frequency value to the preset frequency; obtaining the current operating frequency of the compressor again; When the current operating frequency is less than the preset frequency, the inverter module of the photovoltaic direct-drive centrifugal unit is turned off, so that the photovoltaic direct-drive centrifugal unit enters the steady-state shutdown mode of the photovoltaic direct-drive centrifugal unit.

8. A DC bus voltage impulse suppression device, characterized in that: Applied to a photovoltaic system, the photovoltaic system includes a photovoltaic direct-drive centrifuge, including: A monitoring module, used for monitoring a power-on instruction of the photovoltaic system to obtain a first instruction monitoring result, wherein the power-on instruction is used to instruct a converter in the photovoltaic system to start; A first acquisition module, configured to acquire, when the first instruction monitoring result indicates that the power-on instruction is detected, a historical electrical parameter of the photovoltaic system at a previous moment and a current electrical parameter of the photovoltaic system at a current moment, and compare the historical electrical parameter with the current electrical parameter to obtain an electrical parameter comparison result; A second acquisition module is used to acquire the start-up state of the photovoltaic power generation link of the photovoltaic system after the centrifuge compressor of the photovoltaic system is started when the first instruction monitoring result indicates that the start-up instruction is not detected; A determination module is used to determine the operation mode of the photovoltaic direct-drive centrifugal unit in the photovoltaic system according to the electrical parameter comparison result or the start-up state.

9. A photovoltaic direct-drive centrifuge, characterized in that: The photovoltaic direct-drive centrifuge uses the DC bus voltage impulse suppression method described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein the program executes the DC bus voltage impulse suppression method according to any one of claims 1 to 7.

11. A processor, characterized in that: The processor is used to run a program, wherein the program, when running, executes the DC bus voltage impulse suppression method according to any one of claims 1 to 7.

12. A computer program product comprising computer instructions, characterized in that: When the computer instructions are executed by the processor, the DC bus voltage impulse suppression method according to any one of claims 1 to 7 is performed.

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