Photovoltaic air conditioner operation control method and device, photovoltaic air conditioner and storage medium

Abstract

The invention relates to a photovoltaic air conditioner operation control method and device, a photovoltaic air conditioner and a storage medium, and the method comprises the steps that the bus voltage or the photovoltaic voltage of a photovoltaic module is obtained, the first voltage range where the bus voltage is located or the second voltage range where the photovoltaic voltage is located is determined, and the photovoltaic module operates according to the first voltage range or the second voltage range; and controlling the photovoltaic air conditioner to operate. In this way, the photovoltaic air conditioner is controlled to operate based on the first voltage range where the bus voltage is located or the second voltage range where the photovoltaic voltage is located, and efficient cooperative control over the photovoltaic and air conditioner can be achieved under the condition of no energy storage.

Description

Technical Field

[0001] This application relates to the field of smart home technology, and in particular to a photovoltaic air conditioner operation control method, device, photovoltaic air conditioner and storage medium. Background Technology

[0002] Off-grid photovoltaic air conditioning without energy storage is an important application of renewable energy in off-grid scenarios. Its system does not have energy storage devices, and the power output of the photovoltaic modules needs to be directly supplied to the indoor and outdoor loads of the air conditioner. The power generation capacity of the photovoltaic modules directly determines the power supply capacity to the load.

[0003] Because photovoltaic power generation is affected by factors such as sunlight intensity and ambient temperature, it exhibits significant randomness and uncertainty. When relying solely on photovoltaic power to drive air conditioning operation, during periods of weak sunlight, such as in the morning and evening, the photovoltaic power generation is often insufficient to meet the air conditioning's operational needs. This leads to frequent shutdowns and restarts of the air conditioner, severely impacting the user experience and shortening the overall lifespan of the unit. Furthermore, the instantaneous power surges generated during the air conditioner's start-up and shutdown processes can easily cause fluctuations in the system bus voltage or even power outages, significantly reducing the system's operational reliability.

[0004] The aforementioned problems have limited the promotion and application of off-grid photovoltaic air conditioning without energy storage. Therefore, achieving efficient coordinated control of photovoltaics and air conditioning under conditions without energy storage has become a key technical challenge for promoting the large-scale application of renewable energy in off-grid scenarios, and corresponding solutions are urgently needed. Summary of the Invention

[0005] To address the aforementioned technical challenges in achieving efficient coordinated control of photovoltaic (PV) and air conditioning systems without energy storage, this application provides a PV air conditioning operation control method, device, PV air conditioner, and storage medium. The specific technical solution is as follows: In a first aspect, this application provides a photovoltaic air conditioning operation control method, the method comprising: Obtain the bus voltage or the photovoltaic voltage of the photovoltaic module; Determine the first voltage range in which the bus voltage is located or the second voltage range in which the photovoltaic voltage is located; The operation of the photovoltaic air conditioner is controlled according to the first voltage range or the second voltage range.

[0006] In an optional implementation, the method further includes, before execution: Close the first contactor and the second contactor to supply power to the photovoltaic air conditioner, and detect whether the voltage difference between the photovoltaic voltage of the photovoltaic module and the bus voltage is within the preset error range; The photovoltaic air conditioner is allowed to start when the voltage difference between the photovoltaic module's photovoltaic voltage and the bus voltage is within the preset error range; Upon receiving the start-up command of the photovoltaic air conditioner, and in response to the start-up command, turn on the indoor and outdoor fans of the photovoltaic air conditioner, and stabilize the photovoltaic DC / DC bus voltage to the preset voltage; After a preset first duration, when the photovoltaic voltage of the photovoltaic module and the bus voltage remain normal, the compressor of the photovoltaic air conditioner is turned on.

[0007] In an optional implementation, controlling the operation of the photovoltaic air conditioner according to the first voltage range or the second voltage range includes: When the first voltage range is the first power-sufficient frequency ramp range or the second voltage range is the second power-sufficient frequency ramp range, the compressor of the photovoltaic air conditioner is controlled to ramp up.

[0008] In an optional implementation, controlling the compressor of the photovoltaic air conditioner to increase its frequency includes: Obtain the current operating frequency of the compressor of the photovoltaic air conditioner, and determine the frequency increase step size based on the current operating frequency; The frequency of the photovoltaic air conditioner's compressor is controlled to increase according to the stated frequency increase step size.

[0009] In an optional implementation, controlling the operation of the photovoltaic air conditioner according to the first voltage range or the second voltage range includes: When the first voltage range is the first critical frequency stabilization waiting range or the second voltage range is the second critical frequency stabilization waiting range, the current operating frequency of the compressor of the photovoltaic air conditioner is maintained.

[0010] In an optional implementation, after maintaining the current operating frequency of the photovoltaic air conditioner's compressor, the method further includes: After a preset second duration, obtain the new bus voltage or the new photovoltaic voltage of the photovoltaic module; Determine the new first voltage range in which the new bus voltage is located or the new second voltage range in which the new photovoltaic voltage is located; When the new first voltage range is a first power-sufficient frequency ramp range or the new second voltage range is a second power-sufficient frequency ramp range, the compressor of the photovoltaic air conditioner is controlled to ramp up. If the new first voltage range is the first critical frequency stabilization waiting range or the new second voltage range is the second critical frequency stabilization waiting range, the current operating frequency of the compressor of the photovoltaic air conditioner shall be maintained.

[0011] In an optional implementation, controlling the operation of the photovoltaic air conditioner according to the first voltage range or the second voltage range includes: When the first voltage range is within the first power insufficient frequency reduction range or the second voltage range is within the second power insufficient frequency reduction range, the compressor of the photovoltaic air conditioner is controlled to reduce its frequency.

[0012] In an optional implementation, controlling the compressor of the photovoltaic air conditioner to reduce its frequency includes: Obtain a preset frequency reduction step size, and control the compressor of the photovoltaic air conditioner to reduce the frequency according to the preset frequency reduction step size; or, Determine the power / frequency coefficient between the input power and operating frequency of the compressor in a photovoltaic air conditioner; Determine the minimum photovoltaic power surplus required for the bus voltage to recover from the frequency reduction trigger voltage to the critical stable frequency voltage; Based on the power / frequency coefficient and the minimum photovoltaic power surplus, the theoretical frequency reduction of the compressor of the photovoltaic air conditioner is determined; Obtain the preset frequency reduction duration, and determine the theoretical frequency reduction step size based on the preset frequency reduction duration and the theoretical frequency reduction amplitude; The frequency reduction step size is determined by controlling the compressor of the photovoltaic air conditioner to reduce its frequency.

[0013] In an optional implementation, determining the theoretical frequency reduction of the photovoltaic air conditioner's compressor based on the power / frequency coefficient and the minimum photovoltaic power surplus includes: Dividing the minimum photovoltaic power surplus by the power / frequency coefficient yields the theoretical frequency reduction of the compressor in the photovoltaic air conditioner; The step of determining the theoretical frequency reduction step size based on the preset frequency reduction duration and the theoretical frequency reduction amplitude includes: Obtain the preset redundant frequency reduction, and add the theoretical frequency reduction to the preset redundant frequency reduction to obtain the corrected frequency reduction; Divide the corrected frequency reduction by the preset frequency reduction duration to obtain the theoretical frequency reduction step size; The step of controlling the compressor frequency of the photovoltaic air conditioner to decrease according to the theoretical frequency reduction step size includes: Obtain a preset redundant frequency reduction step size, and add the preset redundant frequency reduction step size to the theoretical frequency reduction step size to obtain the corrected frequency reduction step size; The frequency reduction step size is adjusted to control the compressor frequency of the photovoltaic air conditioner.

[0014] In an optional implementation, after the compressor of the photovoltaic air conditioner is frequency-reduced, the following further steps are taken: To obtain a new bus voltage or a new photovoltaic voltage for the photovoltaic modules; Determine the new first voltage range in which the new bus voltage is located or the new second voltage range in which the new photovoltaic voltage is located; If the new first voltage range is a first critical frequency stabilization waiting range or the new second voltage range is a second critical frequency stabilization waiting range, perform the following operations: After a preset third time period, the process jumps to the step of obtaining a new bus voltage or a new photovoltaic voltage for the photovoltaic module to check whether the frequency upsampling conditions are met.

[0015] In an optional implementation, controlling the operation of the photovoltaic air conditioner according to the first voltage range or the second voltage range includes: When the first voltage range is within the first undervoltage protection range or the second voltage range is within the second undervoltage protection range, the compressor of the photovoltaic air conditioner is controlled to stop running; When the photovoltaic voltage of the photovoltaic module reaches the preset photovoltaic voltage, the compressor of the photovoltaic air conditioner is controlled to start running again.

[0016] In an optional implementation, controlling the operation of the photovoltaic air conditioner according to the first voltage range or the second voltage range includes: When the first voltage range is within the first limit undervoltage protection range or the second voltage range is within the second limit undervoltage protection range, the photovoltaic air conditioner is controlled to stop operating; After a preset fourth time period, the process jumps to the step of detecting whether the voltage difference between the photovoltaic voltage of the photovoltaic module and the bus voltage is within a preset error range.

[0017] Secondly, this application provides a photovoltaic air conditioning operation control device, the device comprising: The voltage acquisition module is used to acquire the bus voltage or the photovoltaic voltage of the photovoltaic module; The range determination module is used to determine the first voltage range in which the bus voltage is located or the second voltage range in which the photovoltaic voltage is located; The operation control module is used to control the operation of the photovoltaic air conditioner according to the first voltage range or the second voltage range.

[0018] Thirdly, a photovoltaic air conditioner is also provided, including a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other through the communication bus; Memory, used to store computer programs; When the processor executes the program stored in the memory, it implements the photovoltaic air conditioning operation control method described in any of the first aspects above.

[0019] Fourthly, a storage medium is also provided, wherein the storage medium stores instructions that, when run on a computer, cause the computer to execute any of the photovoltaic air conditioning operation control methods described in the first aspect above.

[0020] Fifthly, a computer program product containing instructions is also provided, which, when run on a computer, causes the computer to execute any of the aforementioned photovoltaic air conditioning operation control methods.

[0021] Compared with the prior art, the technical solution provided in this application has the following advantages: The photovoltaic air conditioning operation control method provided in this application obtains the bus voltage or the photovoltaic voltage of the photovoltaic module, determines the first voltage range of the bus voltage or the second voltage range of the photovoltaic voltage, and controls the operation of the photovoltaic air conditioning according to the first voltage range or the second voltage range. Thus, controlling the operation of the photovoltaic air conditioning based on the first voltage range of the bus voltage or the second voltage range of the photovoltaic voltage can achieve efficient coordinated control of photovoltaics and air conditioning under conditions without energy storage. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0025] Figure 1 This is a schematic diagram of the architecture of a photovoltaic air conditioning system provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a photovoltaic air conditioner provided in an embodiment of this application; Figure 3 A schematic diagram of the topology of a DC / DC circuit provided in an embodiment of this application; Figure 4 This is a schematic diagram of a photovoltaic sampling circuit provided in an embodiment of this application; Figure 5 A power-voltage curve is provided for an embodiment of this application; Figure 6 A schematic diagram illustrating the implementation process of a photovoltaic air conditioning operation control method provided in this application embodiment; Figure 7A schematic diagram illustrating the implementation process of another photovoltaic air conditioning operation control method provided in this application embodiment; Figure 8 A schematic diagram illustrating the implementation process of another photovoltaic air conditioning operation control method provided in this application embodiment; Figure 9 A schematic diagram illustrating the implementation process of a method for controlling the frequency reduction of a photovoltaic air conditioner compressor, provided in an embodiment of this application; Figure 10 This is a schematic diagram illustrating the implementation process of another photovoltaic air conditioning operation control method provided in this application embodiment; Figure 11 This is a schematic diagram of the structure of a photovoltaic air conditioning operation control device provided in an embodiment of this application; Figure 12 This is a structural schematic diagram of a photovoltaic air conditioner provided in an embodiment of this application. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0028] like Figure 1 The diagram shown is a schematic representation of the architecture of a photovoltaic air conditioning system provided in this application embodiment. It may include a photovoltaic array 11, an outdoor unit, and an indoor unit. The outdoor unit includes a DC / DC circuit 5 (i.e., a photovoltaic DC / DC converter) and an outdoor unit main controller. The photovoltaic array 11 described above is used to convert solar energy into direct current (DC) electricity to provide power. The photovoltaic array can be composed of multiple photovoltaic modules (such as solar panels) connected in series or in parallel, and its output power is affected by the intensity of sunlight.

[0029] The aforementioned indoor unit refers to the terminal equipment of an indoor air conditioning system, responsible for cooling / heating and circulating indoor air. It may include fans, heat exchangers, etc.

[0030] The aforementioned outdoor unit is the power and control unit of the air conditioner. It is used to convert the unstable DC power output by the photovoltaic array into electrical energy suitable for the operation of the air conditioner, control the operating status of the compressor, fan and other loads, and match the output power of the photovoltaic array with the load demand of the air conditioner in real time. It may include a photovoltaic DC / DC converter and an outdoor unit main controller.

[0031] The aforementioned DC / DC circuit 5 is used to adjust the output voltage of the photovoltaic array and track the optimal power point (MPP) of the photovoltaic array in real time, ensuring that the photovoltaic array always outputs the maximum possible power under different lighting conditions, thereby improving the photovoltaic utilization rate.

[0032] The aforementioned outdoor unit main controller is used to collect electrical parameters such as photovoltaic voltage, bus voltage, and bus current, and to determine whether the collected electrical parameters match the load, so as to achieve dynamic adjustment by adjusting the compressor frequency and controlling the contactor on and off. At the same time, it monitors photovoltaic air conditioning faults (such as overvoltage and undervoltage) to trigger the protection mechanism.

[0033] Furthermore, such as Figure 2 The image shown is a structural schematic diagram of a photovoltaic air conditioner provided in an embodiment of this application. Figure 2 Yes Figure 1 The specific hardware components of the provided photovoltaic air conditioning system can be further refined, including a first contactor 1, a second contactor 2, a first voltage sensor 3, a DC current sensor 4, a DC / DC circuit 5, a capacitor 6, a second voltage sensor 7, an air conditioner 8, a power switch 9, a control chip and protection module 10, a photovoltaic array 11, and a busbar 20.

[0034] The system includes a first voltage sensor 3 for monitoring the output voltage of the photovoltaic array 11, a second voltage sensor 7 for monitoring the bus voltage, a power switch 9 for supplying power to the control chip and protection module 10, a bus for connecting the DC / DC circuit 5 and the air conditioner 8 to transmit DC power, a DC current sensor for monitoring the bus current, a first contactor 1 and a second contactor 2 for controlling the power supply to and from the photovoltaic air conditioner, a DC / DC circuit 5 for voltage regulation, a DC current sensor 4 for monitoring the current in the photovoltaic array 11, a capacitor 6 for filtering and stabilizing the voltage of the bus 20, absorbing high-frequency ripple and instantaneous power surges in the circuit, and maintaining the stability of the bus voltage, and an air conditioner 8 for the core load, which may include a compressor, fan, and other components to provide cooling / heating functions. The control chip and protection module 10 execute the operating control logic of the photovoltaic air conditioner, including voltage acquisition, status judgment, frequency adjustment, contactor control, and system protection (such as overvoltage and undervoltage protection). The photovoltaic array 11 converts solar energy into DC power.

[0035] Among them, for Figure 2The topology diagram of DC / DC circuit 5 in the diagram can be seen as follows: Figure 3 As shown, Figure 3 This is a schematic diagram of a DC / DC circuit topology provided in an embodiment of this application. The DC / DC circuit 5 may include an inductor, a power switch, and a diode.

[0036] An inductor is a passive electronic component with energy storage, filtering, and current-impeding characteristics. It stores the electrical energy input to the photovoltaic array 11 when the power switch is turned on. When the power switch is turned off, it releases the stored energy to the bus side to increase or decrease the voltage; at the same time, it suppresses current surges, reduces electromagnetic interference in the circuit, and ensures the stability of the current output.

[0037] Power switching transistors are semiconductor devices (such as MOSFETs and IGBTs) that can be quickly turned on and off. They are used to control the energy storage and release rhythm of inductors through high-frequency switching, adjust the duty cycle of the circuit (the ratio of conduction time to period), and thus achieve precise regulation of the output voltage to meet the stability requirements of the bus and prevent overcurrent and overvoltage.

[0038] A diode is a semiconductor element with unidirectional conductivity. It is used to prevent the electrical energy on the bus side from flowing back to the photovoltaic array 11 or the inductor, thus avoiding reverse breakdown of the element. During the power switch turn-off period, it provides a freewheeling loop for the energy released by the inductor, ensuring that the energy is continuously transmitted to the bus and guaranteeing the continuity of voltage output.

[0039] To monitor the output status of the photovoltaic array 11 in real time, a photovoltaic sampling circuit can be set up, such as... Figure 4 As shown, Figure 4 The schematic diagram of a photovoltaic sampling circuit provided in this application embodiment may include a first voltage divider resistor 10-1, a second voltage divider resistor 10-2, a photovoltaic array 11, a second resistor 12, a capacitor 13, a first filter capacitor 14, a second filter capacitor 15, an isolation operational amplifier 16, a third resistor 17, a first resistor 18, and a main control chip 19.

[0040] The first voltage divider resistor 10-1 and the second voltage divider resistor 10-2 are both composed of two or more resistors connected in series (e.g., ...). Figure 4 The first voltage divider resistor 10-1 includes resistors R1 to R5, and the second voltage divider resistor 10-2 includes resistors R6 to R10, which are connected in parallel at the output terminal of the photovoltaic array 11 to reduce the high output voltage of the photovoltaic array 11 proportionally and ensure that the voltage is within a safe range.

[0041] The first terminal of capacitor 13 is connected to the output terminal of the first voltage divider resistor 10-1, and the second terminal of capacitor 13 is connected to the first terminal of the third resistor 17. The first filter capacitor 14 and the second filter capacitor 15 are capacitor elements used to filter out high-frequency interference components in the voltage signal through charging and discharging characteristics, smooth the voltage waveform, and output a stable DC sampling signal. Specifically, the first filter capacitor 14 is used to filter out noise from the photovoltaic array 11 before voltage division and isolation, and the second filter capacitor 15 is used to filter out noise that may be introduced by the isolation operational amplifier 16 itself or brought by the power supply.

[0042] The isolation operational amplifier 16 refers to an operational amplifier with electrical isolation function. Since there may be a difference in circuit potential between the photovoltaic array 11 and the main control chip, the isolation operational amplifier 16 can disconnect the direct electrical connection between the two sides, preventing current backflow caused by potential difference and protecting the main control chip 19 from high-voltage surges or electromagnetic interference; at the same time, it prevents faults in the photovoltaic array 11 (such as overvoltage) from being conducted to the control side, improving system safety. For low-voltage signals after voltage division that may experience slight attenuation, the isolation operational amplifier 16 can amplify the signal amplitude to the optimal sampling range, improving sampling accuracy; it also has high input impedance and low output impedance characteristics, reducing the impact of the sampling circuit on the photovoltaic output and ensuring the authenticity of the sampled signal. Furthermore, it can suppress common-mode interference (such as grounding noise) between the photovoltaic array 11 and the main control chip 19, further improving the anti-interference capability of the sampled signal and ensuring the stability of voltage acquisition.

[0043] The main control chip 19 is used to receive and process the regulated sampling signal from the isolated operational amplifier 16.

[0044] Based on the above Figure 4 The photovoltaic sampling circuit in the image monitors the output status of the photovoltaic array 11 and obtains a power-voltage curve, as shown below. Figure 5 As shown, Figure 5 This application provides a power-voltage curve diagram. It includes a first sampling curve and a second sampling curve, which respectively represent the relationship between voltage and output power of the photovoltaic array 11 under different operating conditions (such as different light intensities or temperatures). The voltage... The voltage corresponding to the optimal power, where optimal power refers to the voltage at which the photovoltaic array 11 achieves its optimal power. The output power reaches its maximum value under the specified voltage; this point is called the "optimal operating point." The voltage at this point is called the MPP voltage. The current is the MPP current ( Their product is the maximum power Pmax = × .

[0045] In actual operation, the control chip and protection module 10 can be adjusted according to... Figure 2 The DC current sensor 4 collects the current of the bus 20, and the first voltage sensor 3 collects the photovoltaic voltage of the photovoltaic array 11, thereby determining the instantaneous output power of the photovoltaic array 11. This real-time power value is then compared with... Figure 5 The expected power value corresponding to the first or second sampling curve is compared to determine the degree of matching between the current photovoltaic power generation and the air conditioning load demand.

[0046] The PU curve of the photovoltaic array is a single-peak nonlinear curve, and its shape is closely related to the characteristics of the photovoltaic array 11, the light intensity, and the ambient temperature. The specific correlation logic is as follows: When the voltage gradually increases from 0 to Um (MPP voltage): the output power of the photovoltaic array increases rapidly with the voltage increase. At this time, the current decrease rate of the photovoltaic array 11 is lower than the voltage increase rate, and the power shows an upward trend. This stage is the "power growth zone". Correspondingly, the photovoltaic air conditioner can gradually increase the load power (such as compressor frequency increase) to maximize the absorption of photovoltaic power.

[0047] When the voltage reaches Um, the power reaches its maximum value Pmax. At this point, the photovoltaic array 11 has the highest power conversion efficiency and is in its optimal operating state. The DC / DC circuit is used to track the operation at this point.

[0048] When the voltage exceeds Um and continues to rise to Voc (open circuit voltage): the output current of the photovoltaic array drops rapidly, and the rate of drop exceeds the rate of voltage rise, and the power shows a downward trend. This stage is the "power decay zone". If the photovoltaic air conditioner load power remains unchanged at this time, the photovoltaic power will not be able to match the load demand, and the compressor needs to be frequency reduced or shut down to avoid system failure.

[0049] like Figure 6 The diagram shown is a schematic representation of the implementation process of a photovoltaic air conditioning operation control method provided in this application embodiment, applied to the above-mentioned... Figure 2 The provided photovoltaic air conditioner may specifically include the following steps: S601, obtain the bus voltage or the photovoltaic voltage of the photovoltaic module.

[0050] In this embodiment, the bus voltage or the photovoltaic voltage of the photovoltaic module is obtained. The bus voltage refers to the voltage on the common DC power supply line connecting the photovoltaic power generation side (after DC / DC conversion) and the air conditioning load side (compressor, fan, etc.) in the photovoltaic air conditioning system. Figure 2 The voltage of the intermediate bus 20 can be obtained by the second voltage sensor 7. The photovoltaic module is used to convert solar energy into DC power. The photovoltaic module corresponds to Figure 2 In photovoltaic array 11, photovoltaic voltage refers to the voltage at the output terminal of the photovoltaic module, i.e. Figure 2The output voltage of the photovoltaic array 11 can be obtained by the first voltage sensor 3.

[0051] S602, determine the first voltage range of the bus voltage or the second voltage range of the photovoltaic voltage.

[0052] In this embodiment, a first voltage range in which the bus voltage is located or a second voltage range in which the photovoltaic voltage is located is determined. The first voltage range refers to a voltage range that matches the bus voltage, determined from a pre-defined voltage range for the bus voltage. The second voltage range refers to a voltage range that matches the photovoltaic voltage, determined from a pre-defined voltage range based on the ratio of the photovoltaic voltage to the open-circuit voltage.

[0053] For example, the pre-set voltage ranges for the bus voltage can be: First power sufficient frequency increase range (395V, 405V), indicating that the photovoltaic module generates enough power and the load can be safely increased; First critical frequency stabilization waiting range (385V, 393V), indicating that the photovoltaic module's power generation and load are barely balanced and the current situation needs to be maintained for observation; First power insufficient frequency reduction range (370V, 383V), indicating that the photovoltaic module's power generation is insufficient and the load's power consumption needs to be reduced; First undervoltage protection range (360V, 365V), indicating severe undervoltage and the need to suspend the core load (the compressor of the photovoltaic air conditioner); First extreme undervoltage protection range (0, 350V), indicating that the photovoltaic air conditioner is on the verge of collapse and the entire unit needs to be shut down.

[0054] The voltage ranges preset based on the ratio of photovoltaic voltage to open-circuit voltage can be categorized as follows: Second power-amplitude frequency ramp-up range (0.9Voc, +∞), indicating a large power generation potential for the photovoltaic module; Second critical frequency stabilization waiting range (0.86Voc, 0.89Voc), indicating the photovoltaic module is operating near its optimal power point (MPP), but with limited margin; Second power-deficient frequency ramp-down range (e.g., 0.82Voc, 0.85Voc), indicating the photovoltaic module has deviated from its MPP and its power generation capacity has decreased; Second undervoltage protection range (0.7Voc, 0.77Voc), indicating severe insufficient sunlight and very low photovoltaic module power generation; and Second extreme undervoltage protection range (0, 0.65Voc), indicating extremely weak sunlight and almost no power generation capacity of the photovoltaic module.

[0055] S603 controls the operation of the photovoltaic air conditioner according to the first voltage range or the second voltage range.

[0056] In this embodiment of the application, the operation of the photovoltaic air conditioner is controlled according to a first voltage range or a second voltage range.

[0057] Based on the above description of the technical solutions provided in the embodiments of this application, the bus voltage or the photovoltaic voltage of the photovoltaic module is obtained, a first voltage range in which the bus voltage is located or a second voltage range in which the photovoltaic voltage is located is determined, and the operation of the photovoltaic air conditioner is controlled according to the first voltage range or the second voltage range. Thus, controlling the operation of the photovoltaic air conditioner based on the first voltage range in which the bus voltage is located or the second voltage range in which the photovoltaic voltage is located enables efficient coordinated control of photovoltaics and air conditioning under conditions without energy storage.

[0058] Based on this, such as Figure 7 The diagram shown is a schematic representation of the implementation process of another photovoltaic air conditioning operation control method provided in this application embodiment. This method may specifically include the following steps: S701 closes the first and second contactors to supply power to the photovoltaic air conditioner and detects whether the voltage difference between the photovoltaic voltage of the photovoltaic module and the bus voltage is within the preset error range.

[0059] In this embodiment, closing the first and second contactors supplies power to the photovoltaic air conditioner and detects whether the voltage difference between the photovoltaic module's photovoltaic voltage and the bus voltage is within a preset error range. The first contactor controls the connection between the photovoltaic module and the bus, and the second contactor controls the connection between the bus and the air conditioner load (compressor, fan drive, etc.). The preset error range refers to a pre-set safety threshold range, such as (0, 5V), used to determine whether the potentials on the photovoltaic side and the bus side are basically balanced.

[0060] For example, if the preset error range is (0, 5V), and the voltage difference between the photovoltaic voltage of the photovoltaic module and the bus voltage is 2V, then the voltage difference between the photovoltaic voltage of the photovoltaic module and the bus voltage is within the preset error range; if the voltage difference between the photovoltaic voltage of the photovoltaic module and the bus voltage is 6V, then the voltage difference between the photovoltaic voltage of the photovoltaic module and the bus voltage is not within the preset error range.

[0061] S702, when the voltage difference between the photovoltaic voltage of the photovoltaic module and the bus voltage is within the preset error range, the photovoltaic air conditioner is allowed to start.

[0062] In this embodiment of the application, the photovoltaic air conditioner is allowed to start when the voltage difference between the photovoltaic voltage of the photovoltaic module and the bus voltage is within a preset error range.

[0063] S703 receives the start-up command of the photovoltaic air conditioner, and in response to the start-up command, turns on the indoor and outdoor fans of the photovoltaic air conditioner, and the photovoltaic DC / DC stabilizing bus voltage is brought to the preset voltage.

[0064] In this embodiment, a power-on command from a photovoltaic air conditioner is received. In response to the power-on command, the indoor and outdoor fans of the photovoltaic air conditioner are turned on, and the photovoltaic DC / DC stabilizing bus voltage is brought to a preset voltage. The power-on command is a user operation or automatic control signal used to control the photovoltaic air conditioner to switch from standby to operating mode. The preset voltage refers to a pre-set steady-state operating voltage value of the DC bus (e.g., 400V).

[0065] Specifically, the smaller, less impactful internal and external fans can be turned on first to establish the initial load. At the same time, the photovoltaic DC / DC converter starts working, performs maximum power point tracking (MPPT), and outputs electrical energy to regulate and stabilize the bus voltage at the preset voltage.

[0066] S704: After a preset first time period, when the photovoltaic voltage of the photovoltaic module and the bus voltage remain normal, the compressor of the photovoltaic air conditioner is turned on.

[0067] In this embodiment, after a preset first duration, when the photovoltaic voltage of the photovoltaic module and the bus voltage remain normal, the compressor of the photovoltaic air conditioner is turned on. The preset first duration is a delay time (e.g., 30 seconds) set to ensure the operational stability of the photovoltaic air conditioner under wind turbine load. Normal photovoltaic voltage and bus voltage means that neither the monitored photovoltaic voltage nor the bus voltage drops below a preset undervoltage or fault threshold, indicating that under the current wind turbine load, the photovoltaic power generation and power consumption can maintain a balance, and the photovoltaic air conditioner can operate stably.

[0068] S705, determine the first voltage range of the bus voltage or the second voltage range of the photovoltaic voltage.

[0069] In this embodiment of the application, this step is similar to step S602 above, and will not be described in detail here.

[0070] S706 controls the compressor frequency of the photovoltaic air conditioner to increase when the first voltage range is the first power-sufficient frequency increase range or the second voltage range is the second power-sufficient frequency increase range.

[0071] In this embodiment of the application, when the first voltage range is the first power-sufficient frequency-increase range or the second voltage range is the second power-sufficient frequency-increase range, the compressor frequency of the photovoltaic air conditioner is controlled to increase.

[0072] For example, a first voltage range of (395V, 405V) or a second voltage range of (0.9, +∞)Voc can be used to control the compressor frequency of a photovoltaic air conditioner.

[0073] Specifically, controlling the frequency increase of the compressor in a photovoltaic air conditioner can include the following steps: Step 1: Obtain the current operating frequency of the photovoltaic air conditioner's compressor, and determine the frequency ramp-up step size based on the current operating frequency.

[0074] In this embodiment, the current operating frequency of the photovoltaic air conditioner's compressor is obtained, and the frequency ramp-up step size is determined based on the current operating frequency. Specifically, a preset frequency can be obtained. When the current operating frequency of the photovoltaic air conditioner's compressor is less than or equal to the preset frequency, a larger frequency ramp-up step size is set to accelerate the response speed, allowing the load power to quickly approach the surplus power generation of the photovoltaic module. When the current operating frequency of the photovoltaic air conditioner's compressor is greater than the preset frequency, a smaller frequency ramp-up step size is set to avoid power overshoot due to excessively rapid adjustment.

[0075] For example, if the preset frequency is 20Hz, when the compressor's current operating frequency is less than or equal to 20Hz, the frequency increase step can be 1Hz every 2 minutes; when the compressor's current operating frequency is greater than 20Hz, the frequency increase step can be 1Hz every 3 minutes.

[0076] Step 2: Control the compressor of the photovoltaic air conditioner to increase its frequency according to the frequency increase step size.

[0077] In this embodiment, the compressor frequency of the photovoltaic air conditioner is controlled to increase according to the frequency increase step size. That is, according to the frequency increase step size determined in step 1, the driving frequency of the compressor is gradually increased, thereby smoothly increasing its power consumption.

[0078] S707 controls the photovoltaic air conditioner to stop operating when the first voltage range is within the first limit undervoltage protection range or the second voltage range is within the second limit undervoltage protection range.

[0079] In this embodiment, the photovoltaic air conditioner is controlled to stop operating when the first voltage range is within the first limit undervoltage protection range or the second voltage range is within the second limit undervoltage protection range. When the first voltage range is within the first limit undervoltage protection range or the second voltage range is within the second limit undervoltage protection range, it indicates that the power generation of the photovoltaic module is extremely insufficient and cannot support the operation of the load, and is on the verge of a power outage. At this time, the photovoltaic air conditioner (including compressor, fan, etc.) should be immediately controlled to completely stop operating to prevent the load in the photovoltaic air conditioner from being damaged by operating under abnormally low voltage.

[0080] S708, after a preset fourth time period, jump to the step of detecting whether the voltage difference between the photovoltaic voltage of the photovoltaic module and the bus voltage is within the preset error range.

[0081] In this embodiment, after a preset fourth duration, the process jumps to the step of detecting whether the voltage difference between the photovoltaic voltage of the photovoltaic module and the bus voltage is within a preset error range, i.e., step S701. The preset fourth duration is a pre-set time, such as 3 minutes, used to provide a fault recovery waiting period for the photovoltaic air conditioner.

[0082] Based on this, such as Figure 8 The diagram shown is a schematic representation of the implementation process of another photovoltaic air conditioning operation control method provided in this application embodiment. The method may specifically include the following steps: S801, obtain the bus voltage or the photovoltaic voltage of the photovoltaic module.

[0083] In this embodiment of the application, this step is similar to step S601 above, and will not be described in detail here.

[0084] S802, determine the first voltage range of the bus voltage or the second voltage range of the photovoltaic voltage.

[0085] In this embodiment of the application, this step is similar to step S602 above, and will not be described in detail here.

[0086] S803, when the first voltage range is the first critical frequency stabilization waiting range or the second voltage range is the second critical frequency stabilization waiting range, maintain the current operating frequency of the compressor of the photovoltaic air conditioner.

[0087] In this embodiment of the application, when the first voltage range is the first critical frequency stabilization waiting range or the second voltage range is the second critical frequency stabilization waiting range, the current operating frequency of the compressor of the photovoltaic air conditioner is maintained, that is, the current operating frequency of the compressor of the photovoltaic air conditioner remains unchanged.

[0088] It should be noted that after maintaining the current operating frequency of the photovoltaic air conditioner's compressor, the following steps are also included: Step 1: After a preset second duration, obtain the new bus voltage or the new photovoltaic voltage of the photovoltaic module.

[0089] In this embodiment, after a preset second duration, a new bus voltage or a new photovoltaic voltage of the photovoltaic module is obtained. The preset second duration refers to a pre-set period used as a status observation cycle, such as 5 minutes.

[0090] For example, after 5 minutes, the bus voltage or the photovoltaic voltage of the photovoltaic module is re-acquired to obtain a new bus voltage or a new photovoltaic voltage of the photovoltaic module.

[0091] Step 2: Determine the new first voltage range in which the new bus voltage is located or the new second voltage range in which the new photovoltaic voltage is located.

[0092] In the embodiments of this application, a new first voltage range in which the new bus voltage is located or a new second voltage range in which the new photovoltaic voltage is located is determined.

[0093] In this embodiment of the application, this step is similar to step S602 above, and will not be described in detail here.

[0094] Step 3: When the new first voltage range is the first power-sufficient frequency increase range or the new second voltage range is the second power-sufficient frequency increase range, control the compressor of the photovoltaic air conditioner to increase its frequency.

[0095] In this embodiment of the application, this step is similar to step S706 above, and will not be described in detail here.

[0096] Step 4: If the new first voltage range is the first critical frequency stabilization waiting range or the new second voltage range is the second critical frequency stabilization waiting range, continue to maintain the current operating frequency of the photovoltaic air conditioner compressor.

[0097] In this embodiment of the application, this step is similar to step S803 above, and will not be described in detail here.

[0098] S804 controls the compressor of the photovoltaic air conditioner to reduce its frequency when the first voltage range is within the first power insufficient frequency reduction range or the second voltage range is within the second power insufficient frequency reduction range.

[0099] In this embodiment of the application, when the first voltage range is the first power insufficient frequency reduction range or the second voltage range is the second power insufficient frequency reduction range, the compressor of the photovoltaic air conditioner is controlled to reduce the frequency.

[0100] For example, when the first voltage range is within (0.82, 0.85) or the second voltage range is within (370, 383), the compressor of the photovoltaic air conditioner is controlled to operate at a reduced frequency.

[0101] To control the compressor frequency reduction of a photovoltaic air conditioner, the following steps can be taken: obtaining a preset frequency reduction step size, and controlling the compressor frequency reduction of the photovoltaic air conditioner according to the preset frequency reduction step size. The preset frequency reduction step size refers to a fixed adjustment amount (e.g., 0.5 Hz / s) pre-set to gradually reduce the compressor operating frequency when the photovoltaic power of the photovoltaic module is detected to be insufficient to maintain the current load.

[0102] For controlling the compressor frequency reduction of a photovoltaic (PV) air conditioner, the process may also include: determining the power / frequency coefficient between the compressor's input power and operating frequency; determining the minimum PV power surplus required for the bus voltage to recover from the frequency reduction trigger voltage to the critical stable frequency voltage; determining the theoretical frequency reduction amplitude of the PV air conditioner's compressor based on the power / frequency coefficient and the minimum PV power surplus; obtaining the preset frequency reduction duration; determining the theoretical frequency reduction step size based on the preset frequency reduction duration and the theoretical frequency reduction amplitude; and controlling the compressor frequency reduction of the PV air conditioner according to the theoretical frequency reduction step size. The minimum PV power surplus required for the critical stable frequency voltage refers to the amount of time (e.g., 1 minute) required for the bus voltage to recover from the lower voltage point (frequency reduction trigger voltage) that triggers the frequency reduction and stabilize within the critical stable frequency voltage range. The preset frequency reduction duration refers to the pre-set time for reducing the compressor frequency.

[0103] Specifically, the power / frequency coefficient between the input power and operating frequency of the photovoltaic air conditioner compressor is determined as a proportional coefficient to describe the linear relationship between the input power and operating frequency of the photovoltaic air conditioner compressor, and characterizes the change in load power corresponding to a unit frequency change.

[0104] The theoretical frequency reduction of the compressor in a photovoltaic air conditioner can be determined by dividing the minimum photovoltaic power surplus by the power / frequency coefficient.

[0105] To determine the theoretical frequency reduction step size based on the preset frequency reduction duration and the theoretical frequency reduction magnitude, you can refer to... Figure 9 The method shown. (As illustrated) Figure 9 The diagram shown is a schematic representation of an implementation flow of a method for controlling the frequency reduction of a photovoltaic air conditioner compressor according to an embodiment of this application. The method may specifically include the following steps: S901, obtain the preset redundant frequency reduction, add the theoretical frequency reduction to the preset redundant frequency reduction, and obtain the corrected frequency reduction.

[0106] In this embodiment, a preset redundant frequency reduction is obtained, and the theoretical frequency reduction is added to the preset redundant frequency reduction to obtain the corrected frequency reduction. The preset redundant frequency reduction is a pre-set safety buffer frequency value used to prevent insufficient adjustment from causing the bus voltage to fail to recover to a safe range.

[0107] For example, if the preset redundancy frequency reduction is 2Hz and the theoretical frequency reduction is 8Hz, then the corrected frequency reduction is 2Hz + 8Hz = 10Hz.

[0108] S902 divides the corrected frequency reduction by the preset frequency reduction duration to obtain the theoretical frequency reduction step size.

[0109] In this embodiment of the application, the corrected frequency reduction amplitude is divided by the preset frequency reduction duration to obtain the theoretical frequency reduction step size.

[0110] For example, if the frequency reduction is corrected to 10Hz and the preset reduction duration is 20 seconds, then the theoretical reduction step size is 10Hz / 20s=0.5Hz / s.

[0111] To control the compressor frequency reduction of a photovoltaic air conditioner according to the theoretical frequency reduction step size, the following steps may be included: Step 1: Obtain the preset redundant down-frequency step size, add the preset redundant down-frequency step size to the theoretical down-frequency step size, and obtain the corrected down-frequency step size.

[0112] In this embodiment, a preset redundant frequency reduction step size is obtained, and the preset redundant frequency reduction step size is added to the theoretical frequency reduction step size to obtain the corrected frequency reduction step size. The preset redundant frequency reduction step size is a pre-set frequency adjustment amount per unit time (e.g., 2Hz / s) that is added to compensate for the lag or uncertainty of the execution link when performing frequency adjustment.

[0113] For example, if the theoretical down-frequency step size is 0.5Hz / s and the preset redundant down-frequency step size is 0.05Hz / s, then the corrected down-frequency step size is 0.5Hz / s + 0.05Hz / s = 0.55Hz / s.

[0114] Step 2: Control the compressor of the photovoltaic air conditioner to reduce its frequency according to the corrected frequency reduction step size.

[0115] In this embodiment, the compressor of the photovoltaic air conditioner is controlled to reduce its frequency according to a modified frequency reduction step size. That is, based on the modified frequency reduction step size, the operating frequency of the compressor is reduced at a constant or segmented rate.

[0116] It should be noted that after controlling the compressor of the photovoltaic air conditioner to reduce its frequency, the process may also include: obtaining a new bus voltage or a new photovoltaic voltage of the photovoltaic module; determining the new first voltage range of the new bus voltage or the new second voltage range of the new photovoltaic voltage; and, if the new first voltage range is within the first critical frequency stabilization waiting range or the new second voltage range is within the second critical frequency stabilization waiting range, performing the following operations: After a preset third time interval, the process jumps to the step of obtaining a new bus voltage or a new photovoltaic voltage for the photovoltaic module to check whether the frequency upsampling conditions are met.

[0117] The preset third duration refers to a pre-set delay time, such as 10 minutes, set after the photovoltaic air conditioner enters the critical frequency stabilization waiting state to observe whether the photovoltaic air conditioner has established a new stable balance and to confirm whether the irradiance conditions continue to improve.

[0118] S805 controls the compressor of the photovoltaic air conditioner to stop running when the first voltage range is within the first undervoltage protection range or the second voltage range is within the second undervoltage protection range.

[0119] In this embodiment of the application, when the first voltage range is within the first undervoltage protection range or the second voltage range is within the second undervoltage protection range, the compressor of the photovoltaic air conditioner is controlled to stop running.

[0120] For example, when the first voltage range is (0.7, 0.77) or the second voltage range is (360, 365), the compressor of the photovoltaic air conditioner is controlled to stop running.

[0121] S806: When the photovoltaic voltage of the photovoltaic module reaches the preset photovoltaic voltage, the compressor of the photovoltaic air conditioner is controlled to restart.

[0122] In this embodiment, when the photovoltaic voltage of the photovoltaic module reaches a preset photovoltaic voltage, the compressor of the photovoltaic air conditioner is controlled to restart. The preset photovoltaic voltage refers to a pre-set voltage threshold used to determine whether the photovoltaic power generation has recovered to a level sufficient to safely restart the compressor.

[0123] Furthermore, the photovoltaic air conditioning operation control method provided in this application embodiment is illustrated with specific examples: A photovoltaic air conditioning system comprises photovoltaic modules, an outdoor unit, and an indoor unit. The outdoor unit includes a photovoltaic DC / DC circuit and the necessary control, sampling, and protection circuits, along with a controller, a first contactor, and a second contactor. The first and second contactors are used to disconnect the power supply circuit between the photovoltaic system and the generator set. The generator set's switching power supply draws power from the photovoltaic side (photovoltaic modules) to power the control chip.

[0124] In photovoltaic (PV) air conditioning systems, the mismatch between the PV module's power generation and the unit's air conditioning load power consumption can easily occur during operation, leading to problems such as busbar malfunctions or unit shutdowns. Therefore, this paper proposes a method to address this mismatch.

[0125] Through photovoltaic characteristic curves ( Figure 5 It can be seen that the maximum power point Pmax of the photovoltaic module is within the open-circuit voltage (0.75, 0.85) Voc range, i.e., the Um point. Furthermore, under illumination, the open-circuit voltage of the photovoltaic module is relatively stable with minimal variation. Changes in solar irradiance will lead to variations in the photovoltaic module current and consequently, variations in power.

[0126] like Figure 10 The diagram shown is a schematic representation of another photovoltaic air conditioning operation control method provided in this application. The method may specifically include the following steps: Initially, upon powering on the unit, the first and second contactors are closed to monitor the photovoltaic power supply and bus voltage. If the difference between the photovoltaic voltage and the bus voltage is less than 5V, the air conditioner is considered to meet the start-up conditions and is allowed to start. Upon receiving an air conditioner start-up command, the photovoltaic DC / DC converter begins operation, boosting and stabilizing the bus voltage to 400V. The outdoor and indoor fans of the air conditioner operate. After running for half a minute, if there are no abnormalities in the bus voltage and photovoltaic voltage, the compressor of the photovoltaic air conditioner begins operation.

[0127] When the bus voltage is >0.9Voc or the photovoltaic voltage is between (395V and 405V), if the current operating frequency of the photovoltaic air conditioner compressor is less than or equal to 20Hz, the compressor of the photovoltaic air conditioner will be controlled to increase its frequency by 1Hz every 2 minutes; if the current operating frequency of the photovoltaic air conditioner compressor is greater than 20Hz, the compressor of the photovoltaic air conditioner will be controlled to increase its frequency by 1Hz every 3 minutes.

[0128] When the bus voltage is (0.86Voc, 0.89Voc) or the photovoltaic voltage is (385V, 393V), the compressor of the photovoltaic air conditioner will maintain the current frequency for 5 minutes and then stop increasing the frequency. It will wait for the photovoltaic voltage or bus conditions to be met before it can increase the frequency, i.e., the bus voltage > 0.9Voc or the photovoltaic voltage is (395V, 405V). If the conditions for increasing the frequency are not met after maintaining the current frequency for 5 minutes, it will continue to run for another 5 minutes.

[0129] When the bus voltage is at (0.82Voc, 0.85Voc) or the photovoltaic voltage is at (370V, 383V), the compressor of the photovoltaic air conditioner operates at a reduced frequency (0.5Hz / s) to make the photovoltaic module voltage or bus voltage meet the critical frequency stabilization waiting range conditions, that is, the bus voltage is at (0.86Voc, 0.89Voc) or the photovoltaic voltage is at (385V, 393V), and the frequency increase limit is lifted after 10 minutes.

[0130] When the bus voltage is at (0.7Voc, 0.77Voc) or the photovoltaic voltage is at (360V, 365V), the compressor of the photovoltaic air conditioner immediately stops running. Once the photovoltaic voltage recovers to 0.95Voc, the compressor of the photovoltaic air conditioner restarts.

[0131] When the bus voltage is less than 0.65Voc or the photovoltaic voltage is less than 350V, the entire unit will shut down. After the fault is resolved, the unit will restart three minutes later.

[0132] By using the above methods, the number of downtime failures of the unit during photovoltaic air conditioning operation can be reduced, the stability and reliability of the unit operation can be improved, the photovoltaic absorption can be maximized, and the user experience can be enhanced.

[0133] Corresponding to the above method embodiments, this application also provides a photovoltaic air conditioning operation control device, such as... Figure 11 As shown, it may include: voltage acquisition module 1101, range determination module 1102, and operation control module 1103.

[0134] The voltage acquisition module 1101 is used to acquire the bus voltage or the photovoltaic voltage of the photovoltaic module; The range determination module 1102 is used to determine the first voltage range in which the bus voltage is located or the second voltage range in which the photovoltaic voltage is located. The operation control module 1103 is used to control the operation of the photovoltaic air conditioner according to the first voltage range or the second voltage range.

[0135] This application also provides a photovoltaic air conditioner, such as... Figure 12 As shown, it includes a processor 1201, a communication interface 1202, a memory 1203, and a communication bus 1204. The processor 1201, communication interface 1202, and memory 1203 communicate with each other via the communication bus 1204. Memory 1203 is used to store computer programs; When processor 1201 executes the program stored in memory 1203, it performs the following steps: Obtain the bus voltage or the photovoltaic voltage of the photovoltaic module, determine the first voltage range of the bus voltage or the second voltage range of the photovoltaic voltage, and control the operation of the photovoltaic air conditioner according to the first voltage range or the second voltage range.

[0136] The communication bus mentioned in the photovoltaic air conditioner diagram can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. This communication bus can be divided into address bus, data bus, and control bus. For ease of representation, only one thick line is used in the diagram, but this does not indicate that there is only one bus or one type of bus.

[0137] The communication interface is used for communication between the aforementioned photovoltaic air conditioner and other devices.

[0138] The memory may include random access memory (RAM) or non-volatile memory, such as at least one disk storage device. Optionally, the memory may also be at least one storage device located remotely from the aforementioned processor.

[0139] The processors mentioned above can be general-purpose processors, including central processing units (CPUs), network processors (NPs), etc.; they can also be digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0140] In another embodiment provided in this application, a storage medium is also provided, which stores instructions that, when run on a computer, cause the computer to execute any of the photovoltaic air conditioning operation control methods described in the above embodiments.

[0141] In another embodiment provided in this application, a computer program product containing instructions is also provided, which, when run on a computer, causes the computer to execute any of the photovoltaic air conditioning operation control methods described in the above embodiments.

[0142] In the above embodiments, implementation can be achieved entirely or partially through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a storage medium or transmitted from one storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid state disk (SSD)).

[0143] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0144] The various embodiments in this specification are described in a related manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0145] The above description is merely a preferred embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the scope of protection of this application.

Claims

1. A photovoltaic air conditioning operation control method, characterized in that, The method includes: Obtain the bus voltage or the photovoltaic voltage of the photovoltaic module; Determine the first voltage range in which the bus voltage is located or the second voltage range in which the photovoltaic voltage is located; The operation of the photovoltaic air conditioner is controlled according to the first voltage range or the second voltage range.

2. The method according to claim 1, characterized in that, Before executing the method, the following is also included: Close the first contactor and the second contactor to supply power to the photovoltaic air conditioner, and detect whether the voltage difference between the photovoltaic voltage of the photovoltaic module and the bus voltage is within the preset error range; The photovoltaic air conditioner is allowed to start when the voltage difference between the photovoltaic module's photovoltaic voltage and the bus voltage is within the preset error range; Upon receiving the start-up command of the photovoltaic air conditioner, and in response to the start-up command, turn on the indoor and outdoor fans of the photovoltaic air conditioner, and stabilize the photovoltaic DC / DC bus voltage to the preset voltage; After a preset first duration, when the photovoltaic voltage of the photovoltaic module and the bus voltage remain normal, the compressor of the photovoltaic air conditioner is turned on.

3. The method according to claim 1, characterized in that, The step of controlling the operation of the photovoltaic air conditioner according to the first voltage range or the second voltage range includes: When the first voltage range is the first power-sufficient frequency ramp range or the second voltage range is the second power-sufficient frequency ramp range, the compressor of the photovoltaic air conditioner is controlled to ramp up.

4. The method according to claim 3, characterized in that, The method for controlling the frequency increase of the compressor in the photovoltaic air conditioner includes: Obtain the current operating frequency of the compressor of the photovoltaic air conditioner, and determine the frequency increase step size based on the current operating frequency; The frequency of the photovoltaic air conditioner's compressor is controlled to increase according to the stated frequency increase step size.

5. The method according to claim 1, characterized in that, The step of controlling the operation of the photovoltaic air conditioner according to the first voltage range or the second voltage range includes: When the first voltage range is the first critical frequency stabilization waiting range or the second voltage range is the second critical frequency stabilization waiting range, the current operating frequency of the compressor of the photovoltaic air conditioner is maintained.

6. The method according to claim 5, characterized in that, After maintaining the current operating frequency of the photovoltaic air conditioner's compressor, it also includes: After a preset second duration, obtain the new bus voltage or the new photovoltaic voltage of the photovoltaic module; Determine the new first voltage range in which the new bus voltage is located or the new second voltage range in which the new photovoltaic voltage is located; When the new first voltage range is a first power-sufficient frequency ramp range or the new second voltage range is a second power-sufficient frequency ramp range, the compressor of the photovoltaic air conditioner is controlled to ramp up. If the new first voltage range is the first critical frequency stabilization waiting range or the new second voltage range is the second critical frequency stabilization waiting range, the current operating frequency of the compressor of the photovoltaic air conditioner shall be maintained.

7. The method according to claim 1, characterized in that, The step of controlling the operation of the photovoltaic air conditioner according to the first voltage range or the second voltage range includes: When the first voltage range is within the first power insufficient frequency reduction range or the second voltage range is within the second power insufficient frequency reduction range, the compressor of the photovoltaic air conditioner is controlled to reduce its frequency.

8. The method according to claim 7, characterized in that, The control of the compressor frequency reduction of the photovoltaic air conditioner includes: Obtain a preset frequency reduction step size, and control the compressor of the photovoltaic air conditioner to reduce the frequency according to the preset frequency reduction step size; or, Determine the power / frequency coefficient between the input power and operating frequency of the compressor in a photovoltaic air conditioner; Determine the minimum photovoltaic power surplus required for the bus voltage to recover from the frequency reduction trigger voltage to the critical stable frequency voltage; Based on the power / frequency coefficient and the minimum photovoltaic power surplus, the theoretical frequency reduction of the compressor of the photovoltaic air conditioner is determined; Obtain the preset frequency reduction duration, and determine the theoretical frequency reduction step size based on the preset frequency reduction duration and the theoretical frequency reduction amplitude; The frequency reduction step size is determined by controlling the compressor of the photovoltaic air conditioner to reduce its frequency.

9. The method according to claim 8, characterized in that, The step of determining the theoretical frequency reduction of the compressor of the photovoltaic air conditioner based on the power / frequency coefficient and the minimum photovoltaic power surplus includes: Dividing the minimum photovoltaic power surplus by the power / frequency coefficient yields the theoretical frequency reduction of the compressor in the photovoltaic air conditioner; The step of determining the theoretical frequency reduction step size based on the preset frequency reduction duration and the theoretical frequency reduction amplitude includes: Obtain the preset redundant frequency reduction, and add the theoretical frequency reduction to the preset redundant frequency reduction to obtain the corrected frequency reduction; Divide the corrected frequency reduction by the preset frequency reduction duration to obtain the theoretical frequency reduction step size; The step of controlling the compressor frequency of the photovoltaic air conditioner to decrease according to the theoretical frequency reduction step size includes: Obtain a preset redundant frequency reduction step size, and add the preset redundant frequency reduction step size to the theoretical frequency reduction step size to obtain the corrected frequency reduction step size; The frequency reduction step size is adjusted to control the compressor frequency of the photovoltaic air conditioner.

10. The method according to any one of claims 7 to 9, characterized in that, After the compressor of the photovoltaic air conditioner is frequency reduced, the following is also included: To obtain a new bus voltage or a new photovoltaic voltage for the photovoltaic modules; Determine the new first voltage range in which the new bus voltage is located or the new second voltage range in which the new photovoltaic voltage is located; If the new first voltage range is a first critical frequency stabilization waiting range or the new second voltage range is a second critical frequency stabilization waiting range, perform the following operations: After a preset third time period, the process jumps to the step of obtaining a new bus voltage or a new photovoltaic voltage for the photovoltaic module to check whether the frequency upsampling conditions are met.

11. The method according to claim 1, characterized in that, The step of controlling the operation of the photovoltaic air conditioner according to the first voltage range or the second voltage range includes: When the first voltage range is within the first undervoltage protection range or the second voltage range is within the second undervoltage protection range, the compressor of the photovoltaic air conditioner is controlled to stop running; When the photovoltaic voltage of the photovoltaic module reaches the preset photovoltaic voltage, the compressor of the photovoltaic air conditioner is controlled to start running again.

12. The method according to claim 2, characterized in that, The step of controlling the operation of the photovoltaic air conditioner according to the first voltage range or the second voltage range includes: When the first voltage range is within the first limit undervoltage protection range or the second voltage range is within the second limit undervoltage protection range, the photovoltaic air conditioner is controlled to stop operating; After a preset fourth time period, the process jumps to the step of detecting whether the voltage difference between the photovoltaic voltage of the photovoltaic module and the bus voltage is within a preset error range.

13. A photovoltaic air conditioning operation control device, characterized in that, The device includes: The voltage acquisition module is used to acquire the bus voltage or the photovoltaic voltage of the photovoltaic module; The range determination module is used to determine the first voltage range in which the bus voltage is located or the second voltage range in which the photovoltaic voltage is located; The operation control module is used to control the operation of the photovoltaic air conditioner according to the first voltage range or the second voltage range.

14. A photovoltaic air conditioner, characterized in that, It includes a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus; Memory, used to store computer programs; A processor, when executing a program stored in memory, implements the method described in any one of claims 1-12.

15. A storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the method as described in any one of claims 1-12.

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