A method and device for controlling the operating power of a compressor, a controller and a medium

Abstract

The application discloses a compressor operating power control method and device, a controller and a medium. The method comprises the following steps: acquiring the grid-side input current, bus voltage and load torque of a compressor driving system, and acquiring the mechanical speed of the compressor; obtaining the center frequency of a band-pass filter according to the load torque and the mechanical speed; obtaining the load current of the compressor driving system according to the bus voltage, the load torque and the mechanical speed; obtaining the bus capacitor capacitance value according to the grid-side input current, the load current, the bus voltage and the center frequency of the band-pass filter; comparing the bus capacitor capacitance value with a preset capacitance value, and adjusting the power range of the compressor operation according to the comparison result. The application can identify the bus capacitor capacitance value of the compressor driving system online, thereby automatically adjusting the compressor operating power range according to the bus capacitor capacitance value change, so as to avoid the compressor driving system failure caused by the bus capacitor failure, and enhance the reliability of the driving system.

Description

Technical Field

[0001] This application belongs to the field of variable frequency air conditioner drive technology, and in particular relates to a method, device, controller and medium for controlling the operating power of a compressor. Background Technology

[0002] Currently, most inverter air conditioners use a three-phase AC motor as the compressor drive motor. Since the mains power is single-phase AC, it cannot directly drive the inverter motor. The mains power needs to be converted to DC by a rectifier, and then an inverter generates a three-phase AC voltage to drive the three-phase motor. To decouple the grid input and inverter output, large-capacity electrolytic capacitors are often used to maintain a constant bus voltage. The inverter is the core of the inverter system; its function is to convert the DC bus voltage into three-phase AC power with adjustable frequency and amplitude to drive the three-phase motor.

[0003] Because the lifespan of electrolytic capacitors is affected by changes in ambient temperature, a decrease in capacitance can lead to an inability to effectively buffer instantaneous energy demands, resulting in increased fluctuations in bus voltage (such as sudden voltage drops or spikes during high-frequency compressor operation) and reduced drive accuracy. Therefore, it is necessary to monitor the capacitance of electrolytic capacitors online to prevent compressor drive system failure due to bus capacitor failure. Summary of the Invention

[0004] In view of this, embodiments of this application provide a method, device, controller, and storage medium for controlling the operating power of a compressor, which enables online identification of the capacitance value of the bus capacitor in the compressor drive system to avoid compressor drive system failure due to bus capacitor failure.

[0005] The first aspect of this application provides a method for controlling the operating power of a compressor, including:

[0006] The grid-side input current, bus voltage, and load torque of the compressor drive system are obtained, as well as the mechanical speed of the compressor.

[0007] The center frequency of the bandpass filter is obtained based on the load torque and the mechanical speed.

[0008] The load current of the compressor drive system is obtained based on the bus voltage, the load torque, and the mechanical speed.

[0009] The bus capacitance value is obtained based on the grid-side input current, the load current, the bus voltage, and the center frequency of the bandpass filter.

[0010] The bus capacitor value is compared with a preset value, and the power range of the compressor operation is adjusted according to the comparison result.

[0011] In one possible implementation, obtaining the center frequency of the bandpass filter based on the load torque and the mechanical speed includes:

[0012] The mechanical rotation speed is set to the center frequency of the first bandpass filter;

[0013] Set twice the mechanical rotation speed as the center frequency of the second bandpass filter;

[0014] The load torque is input into the first bandpass filter for filtering to obtain the first amplitude of the load torque;

[0015] The load torque is input into the second bandpass filter for filtering to obtain the second amplitude of the load torque;

[0016] The number of compressor rotors is determined based on the first amplitude and the second amplitude, and the center frequency of the bandpass filter is set based on the number of rotors.

[0017] In one possible implementation, determining the number of compressor rotors based on the first amplitude and the second amplitude, and setting the center frequency of the bandpass filter based on the number of rotors, includes:

[0018] Based on the fact that the first amplitude is greater than the second amplitude, the compressor is determined to be a single-rotor compressor, and the center frequency of the bandpass filter is set to be equal to the mechanical speed.

[0019] Based on the fact that the second amplitude is greater than the first amplitude, the compressor is determined to be a dual-rotor compressor, and the center frequency of the bandpass filter is set to be equal to twice the mechanical speed.

[0020] In one possible implementation, obtaining the load current of the compressor drive system based on the bus voltage, the load torque, and the mechanical speed includes:

[0021] The load power is obtained by multiplying the load torque and the mechanical speed.

[0022] The load current is obtained by dividing the load power by the bus voltage.

[0023] In one possible implementation, obtaining the bus capacitance value based on the grid-side input current, the load current, the bus voltage, and the center frequency of the bandpass filter includes:

[0024] The difference between the grid-side input current and the load current after filtering by the bandpass filter is used to obtain the bus capacitor current.

[0025] The bus voltage is filtered by the bandpass filter and then divided by the bus capacitor current to obtain the bus capacitor value.

[0026] In one possible implementation, comparing the bus capacitor value with a preset capacitance value and adjusting the compressor's operating power range based on the comparison result includes:

[0027] If the bus capacitor value is greater than or equal to the preset value, the operating power range of the compressor will not be adjusted.

[0028] If the bus capacitor value is less than the preset value, the maximum operating power of the compressor is reduced.

[0029] In one possible implementation, the preset capacitance value is set to 70% to 80% of the initial capacitance value of the bus capacitor.

[0030] A second aspect of this application provides a control device for the operating power of a compressor, comprising:

[0031] The acquisition module is used to acquire the grid-side input current, bus voltage, and load torque of the compressor drive system, as well as the mechanical speed of the compressor.

[0032] The processing module is used to obtain the center frequency of the bandpass filter based on the load torque and the mechanical speed; to obtain the load current of the compressor drive system based on the bus voltage, the load torque and the mechanical speed; and to obtain the bus capacitance value based on the grid input current, the load current, the bus voltage and the center frequency of the bandpass filter.

[0033] The control module is used to compare the bus capacitor value with a preset value and adjust the power range of the compressor operation based on the comparison result.

[0034] In one possible implementation, the processing module is specifically used for:

[0035] The mechanical rotation speed is set to the center frequency of the first bandpass filter;

[0036] Set twice the mechanical rotation speed as the center frequency of the second bandpass filter;

[0037] The load torque is input into the first bandpass filter for filtering to obtain the first amplitude of the load torque;

[0038] The load torque is input into the second bandpass filter for filtering to obtain the second amplitude of the load torque;

[0039] The number of compressor rotors is determined based on the first amplitude and the second amplitude, and the center frequency of the bandpass filter is set based on the number of rotors.

[0040] In one possible implementation, the processing module is specifically used for:

[0041] Based on the fact that the first amplitude is greater than the second amplitude, the compressor is determined to be a single-rotor compressor, and the center frequency of the bandpass filter is set to be equal to the mechanical speed.

[0042] Based on the fact that the second amplitude is greater than the first amplitude, the compressor is determined to be a dual-rotor compressor, and the center frequency of the bandpass filter is set to be equal to twice the mechanical speed.

[0043] In one possible implementation, the processing module is specifically used for:

[0044] The load power is obtained by multiplying the load torque and the mechanical speed.

[0045] The load current is obtained by dividing the load power by the bus voltage.

[0046] In one possible implementation, the processing module is specifically used for:

[0047] The difference between the grid-side input current and the load current after filtering by the bandpass filter is used to obtain the bus capacitor current.

[0048] The bus voltage is filtered by the bandpass filter and then divided by the bus capacitor current to obtain the bus capacitor value.

[0049] In one possible implementation, the control module is specifically used for:

[0050] If the bus capacitor value is greater than or equal to the preset value, the operating power range of the compressor will not be adjusted.

[0051] If the bus capacitor value is less than the preset value, the maximum operating power of the compressor is reduced.

[0052] In one possible implementation, the preset capacitance value is set to 70% to 80% of the rated capacitance value of the bus capacitor.

[0053] A third aspect of this application provides a controller, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the compressor operating power control method provided in the first aspect.

[0054] A computer-readable storage medium according to a fourth aspect of this application stores computer-readable instructions that can be executed by a processor to implement the compressor operating power control method provided in the first aspect above.

[0055] The compressor operating power control method, device, controller, and storage medium provided in this application acquire the grid-side input current, bus voltage, and load torque of the compressor drive system, as well as the compressor's mechanical speed. Based on the load torque and mechanical speed, the center frequency of a bandpass filter is obtained. Based on the bus voltage, load torque, and mechanical speed, the load current of the compressor drive system is obtained. Based on the grid-side input current, load current, bus voltage, and the center frequency of the bandpass filter, the bus capacitor value is obtained. The bus capacitor value is compared with a preset value, and the compressor's operating power range is adjusted based on the comparison result. Compared to existing technologies, this application enables online identification of the compressor drive system's bus capacitor value, thereby automatically adjusting the compressor's operating power range based on changes in the bus capacitor value. This avoids compressor drive system failure due to bus capacitor failure, enhancing the reliability of the drive system. Attached Figure Description

[0056] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0057] Appendix Figure 1 A circuit diagram of a compressor drive system provided in this application is shown;

[0058] Appendix Figure 2 A flowchart of a compressor operating power control method provided in this application is shown;

[0059] Appendix Figure 3 This application illustrates the process of using a bandpass filter to confirm whether a compressor is a single-rotor or dual-rotor compressor.

[0060] Appendix Figure 4 This application illustrates the process for identifying the bus capacitor value provided in this application.

[0061] Appendix Figure 5 A schematic diagram of a compressor operating power control device according to an embodiment of this application is shown.

[0062] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0063] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0064] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0065] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0066] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0067] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0068] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, specific embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0069] Figure 1 This is a circuit diagram of a compressor drive system provided in an embodiment of this application.

[0070] In variable frequency air conditioners, when a three-phase AC motor is used as the compressor drive motor, the core of its power supply system is to convert the mains power to adjustable frequency three-phase AC power through the "rectification-inversion" process, thereby precisely controlling the compressor speed.

[0071] The cooling / heating capacity of a compressor is directly related to its speed (the higher the speed, the greater the refrigerant circulation and the stronger the capacity). The speed of a three-phase AC motor is determined by the power supply frequency. Therefore, the fixed-frequency (50Hz) mains power needs to be converted into a frequency-adjustable three-phase AC power to achieve compressor speed regulation. This process relies on a "rectifier-inverter" system.

[0072] like Figure 1 As shown, the rectifier is a bridge rectifier circuit composed of four diodes (D1-D4), which rectifies all the positive and negative half-cycles of single-phase AC power into pulsating DC power.

[0073] Large-capacity electrolytic capacitors are used to filter pulsating DC current, smoothing the waveform and outputting a stable DC bus voltage. A power factor correction (PFC) circuit can be added, using high-frequency switching to adjust the input current waveform to approximate a sine wave, thereby improving the power factor (reducing grid harmonic interference) and stabilizing the DC bus voltage.

[0074] The inverter is the core of frequency conversion; its function is to convert the DC bus voltage into three-phase AC power with adjustable frequency and amplitude to drive a three-phase motor. For example... Figure 1 As shown, the inverter consists of six high-frequency switching devices (S1-S6) forming a three-phase bridge arm (two high-frequency switching devices per phase, divided into an upper bridge arm and a lower bridge arm). The upper and lower bridge arms of each phase are alternately turned on. The amplitude of the output voltage is controlled by adjusting the duty cycle of the PWM pulse; the frequency of the output AC power is controlled by adjusting the switching frequency (e.g., 10-120Hz, corresponding to the compressor speed adjustment range).

[0075] In the drive system of a variable frequency air conditioner, the bus capacitor between the rectified DC bus and the inverter ( Figure 1 The C0 in the inverter is a key component that absorbs the pulsating DC component after rectification, stabilizes the DC bus voltage, and prevents voltage fluctuations from affecting the inverter output. When the compressor operates at high frequency (high power), the motor requires a large instantaneous current, and the bus capacitor replenishes energy through rapid charging and discharging, suppressing the voltage drop of the bus.

[0076] Figure 2 This is a flowchart of a compressor operating power control method provided in an embodiment of this application, as shown below. Figure 2 As shown, the method for controlling the operating power of the compressor includes:

[0077] S101. Obtain the grid-side input current, bus voltage, and load torque of the compressor drive system, as well as the mechanical speed of the compressor.

[0078] like Figure 1 As shown, the grid-side input current is i g The bus voltage is u dc .

[0079] Load torque T L It is based on the load torque observer, which is a control module that indirectly estimates the compressor load torque based on the motor mathematical model and state estimation algorithm, using measurable motor operating parameters (such as speed, current, and voltage). Its principle is to first calculate the derivative of the speed according to the load torque equation. Since the actual speed signal contains high-frequency interference, the derivative will amplify the interference. Therefore, a low-pass filter is added after this stage to eliminate the high-frequency noise interference caused by the derivative. Finally, the load torque is obtained by calculating with the torque signal.

[0080] In practical applications, after the compressor motor starts, the PFC and inverter stages of the compressor drive system operate normally, enabling the load torque observer to sample the grid-side voltage, bus voltage, and compressor current in real time. The load torque observer then obtains the load torque T based on the sampled signals. L .

[0081] The mechanical speed of a compressor refers to the number of times the compressor rotor rotates per minute, usually measured in rpm (revolutions per minute). It is one of the core parameters for measuring the compressor's operating status. Its value directly determines the compressor's refrigerant compression efficiency, cooling / heating capacity, as well as the system's energy consumption, noise, and other performance characteristics.

[0082] S102. Based on the load torque and the mechanical speed, the center frequency of the bandpass filter is obtained.

[0083] The purpose of this application is to determine the frequency characteristics of the capacitor signal by identifying whether the compressor is single-rotor or dual-rotor, and further, to obtain the identification value of the bus capacitor through the relationship between the bus capacitor current and voltage. The frequency characteristics of the load torque corresponding to single-rotor and dual-rotor compressors are different. The frequency characteristics of the load torque can be determined by filtering the load torque using a bandpass filter, thereby determining whether the compressor is single-rotor or dual-rotor.

[0084] Figure 3 The diagram illustrates the process by which a single-rotor or dual-rotor compressor is identified using bandpass filters, as provided in this application. The center frequencies of the two bandpass filters are ω0 and ω1 respectively. r and 2ω r After filtering, the amplitude of the signal is obtained. The one with the larger amplitude is the corresponding single-rotor or dual-rotor compressor.

[0085] refer to Figure 3The above step S102 can be specifically implemented as follows:

[0086] The mechanical rotation speed is set to the center frequency (ω) of the first bandpass filter. r );

[0087] Set twice the mechanical rotation speed as the center frequency (2ω) of the second bandpass filter. r );

[0088] The load torque T L The first bandpass filter is used for filtering to obtain the first amplitude of the load torque.

[0089] The load torque T L The second bandpass filter is used for filtering to obtain the second amplitude of the load torque.

[0090] The number of compressor rotors is determined based on the first amplitude and the second amplitude, and the center frequency of the bandpass filter for subsequent processing is set based on the number of rotors, specifically including:

[0091] Based on the fact that the first amplitude is greater than the second amplitude, the compressor is determined to be a single-rotor compressor, and the center frequency of the bandpass filter used for subsequent processing is set to be equal to the mechanical rotation speed;

[0092] Based on the fact that the second amplitude is greater than the first amplitude, the compressor is determined to be a dual-rotor compressor, and the center frequency of the bandpass filter used for subsequent processing is set to be equal to twice the mechanical speed.

[0093] S103. The load current of the compressor drive system is obtained based on the bus voltage, the load torque and the mechanical speed.

[0094] The above step S103 specifically includes:

[0095] The load power is obtained by multiplying the load torque and the mechanical speed.

[0096] The load current is obtained by dividing the load power by the bus voltage.

[0097] Specifically, the formula for calculating load current is:

[0098] S104. Obtain the bus capacitance value based on the grid-side input current, the load current, the bus voltage, and the center frequency of the bandpass filter.

[0099] The frequency of the bandpass filter is determined by the rotor type. By processing the signal with the bus voltage at the corresponding frequency, the bus capacitance identification value can be obtained.

[0100] Figure 4 The diagram illustrates the process for identifying the bus capacitor value provided in this application. (Reference) Figure 4 The above step S104 can be achieved as follows:

[0101] The grid-side input current i g and the load current After filtering by the bandpass filter, the difference is taken to obtain the bus capacitor current i. cap ;

[0102] The bus voltage u dc After filtering by the bandpass filter, the bus capacitor current i is excluded. cap The bus capacitance value (i.e., the capacitance identification value) is obtained.

[0103] S105. Compare the bus capacitor value with the preset value, and adjust the power range of the compressor operation according to the comparison result.

[0104] The capacitance of the bus capacitor is not constant and gradually decreases with usage time, temperature, voltage stress, and other factors. When it drops below the preset capacitance value, it cannot effectively buffer instantaneous energy demand, leading to increased fluctuations in the bus voltage. When online detection indicates that the bus capacitor capacitance value has dropped to the preset value (e.g., below 70% of the rated capacitance), the system automatically adjusts the compressor's maximum allowable operating power range (i.e., limits the maximum operating frequency).

[0105] Specifically, step S105 can be implemented as follows: if the bus capacitor value is greater than or equal to a preset value, the operating power range of the compressor is not adjusted; if the bus capacitor value is less than the preset value, the maximum operating power of the compressor is reduced.

[0106] Specifically, the preset capacitance value is set to 70% to 80% of the rated capacitance value of the bus capacitor. Of course, the preset capacitance value can be set according to the actual situation, and this application does not limit it.

[0107] The compressor operating power control method provided in this application can identify the bus capacitor value online. This method requires no additional signal injection; it only needs to identify the bus capacitor value based on the signal characteristics presented by the compressor torque characteristics, making it simple to implement and highly robust. It automatically adjusts the compressor operating power range according to changes in the bus capacitor value to prevent compressor drive system failure due to bus capacitor failure, thus enhancing the reliability of the drive system.

[0108] This application provides a compressor operating power control device, which corresponds to the compressor operating power control method in Embodiment 1. For relevant details, please refer to the description in Embodiment 1. The method embodiments described below are merely illustrative.

[0109] Figure 5 This is a schematic diagram of a compressor operating power control device provided in an embodiment of this application, as shown below. Figure 5 As shown, the device 10 includes:

[0110] The acquisition module 101 is used to acquire the grid-side input current, bus voltage and load torque of the compressor drive system, as well as the mechanical speed of the compressor.

[0111] Processing module 102 is used to obtain the center frequency of the bandpass filter based on the load torque and the mechanical speed; obtain the load current of the compressor drive system based on the bus voltage, the load torque and the mechanical speed; and obtain the bus capacitance value based on the grid-side input current, the load current, the bus voltage and the center frequency of the bandpass filter.

[0112] The control module 103 is used to compare the bus capacitor value with a preset value and adjust the power range of the compressor operation according to the comparison result.

[0113] In one possible implementation, the processing module 102 is specifically used for:

[0114] The mechanical rotation speed is set to the center frequency of the first bandpass filter;

[0115] Set twice the mechanical rotation speed as the center frequency of the second bandpass filter;

[0116] The load torque is input into the first bandpass filter for filtering to obtain the first amplitude of the load torque;

[0117] The load torque is input into the second bandpass filter for filtering to obtain the second amplitude of the load torque;

[0118] The number of compressor rotors is determined based on the first amplitude and the second amplitude, and the center frequency of the bandpass filter is set based on the number of rotors.

[0119] In one possible implementation, the processing module 102 is specifically used for:

[0120] Based on the fact that the first amplitude is greater than the second amplitude, the compressor is determined to be a single-rotor compressor, and the center frequency of the bandpass filter is set to be equal to the mechanical speed.

[0121] Based on the fact that the second amplitude is greater than the first amplitude, the compressor is determined to be a dual-rotor compressor, and the center frequency of the bandpass filter is set to be equal to twice the mechanical speed.

[0122] In one possible implementation, the processing module 102 is specifically used for:

[0123] The load power is obtained by multiplying the load torque and the mechanical speed.

[0124] The load current is obtained by dividing the load power by the bus voltage.

[0125] In one possible implementation, the processing module 102 is specifically used for:

[0126] The difference between the grid-side input current and the load current after filtering by the bandpass filter is used to obtain the bus capacitor current.

[0127] The bus voltage is filtered by the bandpass filter and then divided by the bus capacitor current to obtain the bus capacitor value.

[0128] In one possible implementation, the control module 103 is specifically used for:

[0129] If the bus capacitor value is greater than or equal to the preset value, the operating power range of the compressor will not be adjusted.

[0130] If the bus capacitor value is less than the preset value, the maximum operating power of the compressor is reduced.

[0131] In one possible implementation, the preset capacitance value is set to 70% to 80% of the rated capacitance value of the bus capacitor.

[0132] The compressor operating power control device provided in this application acquires the grid-side input current, bus voltage, and load torque of the compressor drive system, as well as the compressor's mechanical speed. Based on the load torque and mechanical speed, it obtains the center frequency of a bandpass filter; based on the bus voltage, load torque, and mechanical speed, it obtains the load current of the compressor drive system; based on the grid-side input current, load current, bus voltage, and the center frequency of the bandpass filter, it obtains the bus capacitor value; and it compares the bus capacitor value with a preset value, adjusting the compressor's operating power range based on the comparison result. Compared to existing technologies, this application enables online identification of the compressor drive system's bus capacitor value, thereby automatically adjusting the compressor's operating power range based on changes in the bus capacitor value. This prevents compressor drive system failure due to bus capacitor failure, enhancing the reliability of the drive system.

[0133] This application also provides a controller, including: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the compressor operating power control method provided in any of the foregoing embodiments of this application. This controller can be used for the control of an air conditioning system.

[0134] The memory may include high-speed random access memory (RAM) or non-volatile memory, such as at least one disk drive. Communication between this system network element and at least one other network element is achieved through at least one communication interface (wired or wireless), which can use the Internet, wide area network, local area network, metropolitan area network, etc.

[0135] The bus can be an ISA bus, PCI bus, or EISA bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. The memory is used to store the program, and the processor executes the program after receiving an execution instruction. The compressor operating power control method disclosed in any of the foregoing embodiments of this application can be applied to a processor, or implemented by the processor.

[0136] The processor may be an integrated circuit chip with signal processing capabilities. In implementation, each step of the above method can be completed through integrated logic circuits in the processor's hardware or through software instructions. The processor can be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc.; it can also be a Digital Signal Processor (DSP), an Application-Specific Integrated Circuit (ASIC), an Off-the-shelf Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this application can be directly embodied in the execution of a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules can be located in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. This storage medium is located in memory; the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above method.

[0137] The compressor and the compressor operating power control method provided in this application embodiment are based on the same inventive concept and have the same beneficial effects as the methods used, operated or implemented.

[0138] This application also provides a computer-readable storage medium storing computer-readable instructions that can be executed by a processor to implement the compressor operating power control method of any embodiment in Embodiment 1.

[0139] Examples of the computer-readable storage medium may also include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other optical or magnetic storage media, which will not be described in detail here.

[0140] The computer-readable storage medium provided in the above embodiments of this application and the compressor operating power control method provided in the embodiments of this application are based on the same inventive concept and have the same beneficial effects as the methods adopted, run or implemented by the application programs stored therein.

[0141] It should be noted that:

[0142] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of this application may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0143] Similarly, it should be understood that, in order to simplify this application and aid in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of this application, various features of this application are sometimes grouped together into a single embodiment, figure, or description thereof. However, this method of disclosure should not be construed as reflecting an intention that the claimed application requires more features than are expressly recited in each claim. Rather, as reflected in the following claims, inventive aspects lie in fewer than all features of a single foregoing disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into that detailed description, wherein each claim itself is a separate embodiment of this application.

[0144] Those skilled in the art will understand that modules in the device of the embodiments can be adaptively changed and placed in one or more devices different from that embodiment. Modules, units, or components in the embodiments can be combined into a single module, unit, or component, and further, they can be divided into multiple sub-modules, sub-units, or sub-components. Except where at least some of such features and / or processes or units are mutually exclusive, any combination can be used to combine all features disclosed in this specification (including the accompanying claims, abstract, and drawings) and all processes or units of any method or device so disclosed. Unless expressly stated otherwise, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) may be replaced by an alternative feature that serves the same, equivalent, or similar purpose.

[0145] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features but not others included in other embodiments, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, in the following claims, any of the claimed embodiments can be used in any combination.

[0146] It should be noted that the above embodiments are illustrative of this application and not restrictive, and that those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. This application can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names.

[0147] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made under the concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method for controlling the operating power of a compressor, characterized in that, include: The grid-side input current, bus voltage, and load torque of the compressor drive system are obtained, as well as the mechanical speed of the compressor. The center frequency of the bandpass filter is obtained based on the load torque and the mechanical speed. The load current of the compressor drive system is obtained based on the bus voltage, the load torque, and the mechanical speed. The bus capacitance value is obtained based on the grid-side input current, the load current, the bus voltage, and the center frequency of the bandpass filter. The bus capacitor value is compared with a preset value, and the power range of the compressor operation is adjusted according to the comparison result; The step of obtaining the center frequency of the bandpass filter based on the load torque and the mechanical speed includes: The mechanical rotation speed is set to the center frequency of the first bandpass filter; Set twice the mechanical rotation speed as the center frequency of the second bandpass filter; The load torque is input into the first bandpass filter for filtering to obtain the first amplitude of the load torque; The load torque is input into the second bandpass filter for filtering to obtain the second amplitude of the load torque; The number of compressor rotors is determined based on the first amplitude and the second amplitude, and the center frequency of the bandpass filter is set based on the number of rotors.

2. The method for controlling the operating power of a compressor according to claim 1, characterized in that, The step of determining the number of compressor rotors based on the first amplitude and the second amplitude, and setting the center frequency of the bandpass filter based on the number of rotors, includes: Based on the fact that the first amplitude is greater than the second amplitude, the compressor is determined to be a single-rotor compressor, and the center frequency of the bandpass filter is set to be equal to the mechanical speed. Based on the fact that the second amplitude is greater than the first amplitude, the compressor is determined to be a dual-rotor compressor, and the center frequency of the bandpass filter is set to be equal to twice the mechanical speed.

3. The method for controlling the operating power of a compressor according to claim 1, characterized in that, The step of obtaining the load current of the compressor drive system based on the bus voltage, the load torque, and the mechanical speed includes: The load power is obtained by multiplying the load torque and the mechanical speed. The load current is obtained by dividing the load power by the bus voltage.

4. The method for controlling the operating power of a compressor according to claim 1, characterized in that, The step of obtaining the bus capacitance value based on the grid-side input current, the load current, the bus voltage, and the center frequency of the bandpass filter includes: The bus capacitor current is obtained by filtering the grid-side input current and the load current through the bandpass filter and then taking the difference. The bus voltage is filtered by the bandpass filter and then combined with the bus capacitor current to obtain the bus capacitor value.

5. The method for controlling the operating power of a compressor according to claim 1, characterized in that, The step of comparing the bus capacitor value with a preset value and adjusting the compressor's operating power range based on the comparison result includes: If the bus capacitor value is greater than or equal to the preset value, the operating power range of the compressor will not be adjusted. If the bus capacitor value is less than the preset value, the maximum operating power of the compressor is reduced.

6. The method for controlling the operating power of a compressor according to claim 5, characterized in that, The preset capacitance value is set to 70% to 80% of the rated capacitance value of the bus capacitor.

7. A control device for the operating power of a compressor, characterized in that, include: The acquisition module is used to acquire the grid-side input current, bus voltage, and load torque of the compressor drive system, as well as the mechanical speed of the compressor. The processing module is used to obtain the center frequency of the bandpass filter based on the load torque and the mechanical speed; to obtain the load current of the compressor drive system based on the bus voltage, the load torque and the mechanical speed; and to obtain the bus capacitance value based on the grid input current, the load current, the bus voltage and the center frequency of the bandpass filter. The control module is used to compare the capacitance value of the bus capacitor with the preset capacitance value and adjust the power range of the compressor operation according to the comparison result; The processing module is specifically used for: The mechanical rotation speed is set to the center frequency of the first bandpass filter; Set twice the mechanical rotation speed as the center frequency of the second bandpass filter; The load torque is input into the first bandpass filter for filtering to obtain the first amplitude of the load torque; The load torque is input into the second bandpass filter for filtering to obtain the second amplitude of the load torque; The number of compressor rotors is determined based on the first amplitude and the second amplitude, and the center frequency of the bandpass filter is set based on the number of rotors.

8. A controller, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the method for controlling the operating power of the compressor according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, It stores computer-readable instructions that can be executed by a processor to implement the method as described in any one of claims 1 to 6.

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